{"id":2587,"date":"2023-08-29T21:56:41","date_gmt":"2023-08-29T21:56:41","guid":{"rendered":"https:\/\/blog.praxilabs.com\/?p=2587"},"modified":"2025-08-22T21:09:55","modified_gmt":"2025-08-22T21:09:55","slug":"coefficient-of-viscosity-using-stokes-method","status":"publish","type":"post","link":"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/","title":{"rendered":"Learn How to Determine the Coefficient of Viscosity Using Stoke&#8217;s Method"},"content":{"rendered":"<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Imagine that you have a cup with a hole in the bottom. If you pour honey or glycerin into the cup, you will find that the cup drains very slowly. But in the case of water, the cup will drain much more quickly. That happens because &#8220;viscosity&#8221; is higher in the case of honey or glycerin when compared to other liquids&#8217; viscosities.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Viscosity is one of the essential parameters that describe the physicochemical properties of liquids. It is a measurement of a fluid&#8217;s resistance to flow or change in shape at a given rate<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">In this article, we will discuss what is meant by viscosity, the concept of coefficient viscosity, how to determine the coefficient of viscosity using Stoke&#8217;s method, and more.<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2585\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Viscosity.jpg\" alt=\"What is Viscosity?\" width=\"1000\" height=\"456\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Viscosity.jpg 1000w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Viscosity-300x137.jpg 300w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Viscosity-768x350.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>What is Viscosity?<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Viscosity can be defined as a force multiplied by a time divided by an area. It is a measure of a fluid&#8217;s resistance to flow<span style=\"font-weight: 400;\"> and describes the internal friction of a fluid that is moving.<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">For further understanding, when you put some drops of honey on one side on an inclined surface and some water droplets on the other side and observe the flow of fluid. You will notice that water flows much faster than honey, which flows very slowly and cannot be moved easily. This happens due to the viscosity of the material.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Notice that a high viscosity of fluid resists motion because its molecular makeup gives it a variety of internal friction. However, the low-viscosity fluid flows easily because its molecular makeup results in little or no friction in case of movement.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Gases have viscosity like fluids, but it is difficult to be noticed in ordinary circumstances.<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2583\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Comparing-high-viscosity-fluid-to-low-viscosity-fluid.jpg\" alt=\"high viscosity &amp; low viscosity\" width=\"924\" height=\"634\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Comparing-high-viscosity-fluid-to-low-viscosity-fluid.jpg 924w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Comparing-high-viscosity-fluid-to-low-viscosity-fluid-300x206.jpg 300w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Comparing-high-viscosity-fluid-to-low-viscosity-fluid-768x527.jpg 768w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Comparing-high-viscosity-fluid-to-low-viscosity-fluid-110x75.jpg 110w\" sizes=\"auto, (max-width: 924px) 100vw, 924px\" \/><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\"> <span style=\"font-weight: 400; font-size: 14pt;\">Viscosity depends on factors related to the fluid&#8217;s state, such as:<\/span>\u00a0 \u00a0 \u00a0 \u00a0 <\/span><\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">The fluid temperature.<\/span><\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Deformation rate.<\/span><\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">pressure.<\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Note: The dependence on these factors may be <\/span><span style=\"font-weight: 400;\">negligible <\/span><span style=\"font-weight: 400;\">in certain cases. For example, the Newtonian fluid&#8217;s viscosity does not vary with the deformation rate.<\/span><\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\r\n<div class=\"ez-toc-title-container\">\r\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\r\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\r\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Coefficient_of_Viscosity\" >Coefficient of Viscosity<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Viscous_Gradient\" >Viscous Gradient<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Examples_of_Coefficient_of_Viscosity\" >Examples of Coefficient of Viscosity\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#The_Coefficient_of_Viscosity_Using_Stokes_Method\" >The Coefficient of Viscosity Using Stoke&#8217;s Method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Importance_of_Stokes_Law\" >Importance of Stoke\u2019s Law<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Stokes_Law_Derivation\" >Stoke\u2019s Law Derivation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Determination_of_the_Coefficient_of_Viscosity_by_Stokes_Method_Experiment_From_PraxiLabs\" >Determination of the Coefficient of Viscosity by Stoke&#8217;s Method Experiment From PraxiLabs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Learning_Objectives\" >Learning Objectives<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#Theoretical_Background\" >Theoretical Background<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/praxilabs.com\/en\/blog\/2023\/08\/29\/coefficient-of-viscosity-using-stokes-method\/#The_steps_of_the_Experiment\" >The steps of the Experiment<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\r\n<h2><span class=\"ez-toc-section\" id=\"Coefficient_of_Viscosity\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Coefficient of Viscosity<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">To understand what is meant by the coefficient of viscosity, you should understand the meaning of &#8220;The viscous grad<\/span><span style=\"font-weight: 400;\">ient&#8221; first.<\/span><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Viscous_Gradient\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Viscous Gradient<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The viscous gradient is the distinction inside the velocity among the fluid&#8217;s adjacent layers If more force is applied by the upper layer to move forward the more will be the viscous gradient.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The viscous gradient is the difference in the velocity between the fluid&#8217;s adjacent layers. If more force is applied by the upper layer to move forward.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0It is given by v\/x, where v is the velocity difference and x is the difference of distance between the two layers.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Now, let&#8217;s define the coefficient of viscosity:<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The coefficient of viscosity is the ratio of the shearing stress to the velocity gradient of the fluid (\u03b7).<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The coefficient of viscosity is given by the following relation:<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u03b7\u00a0 = F . d \/ A .\u2174<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Where:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">F is the force required to maintain a unit velocity gradient between two parallel layers of liquid of a unit area.<\/span><\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">d is the distance between the two layers of liquid skidding over each other<\/span><\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">A is the area<\/span><\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">\u2174<\/span><span style=\"font-weight: 400;\"> is the velocity.<\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The coefficient of viscosity is a measure of how easily or difficult a fluid flows under the effect of external forces, and it plays a very important role in many industrial, scientific, and everyday applications.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Examples_of_Coefficient_of_Viscosity\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Examples of Coefficient of Viscosity\u00a0<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>Water<\/strong>: The coefficient of viscosity for water at 20\u00b0C is nearly 0.001 Pa\u00b7s (pascal-seconds) or 1 centipoise (cP). This is considered a relatively low viscosity that allows water to flow easily and is one of the reasons why it is commonly used for viscosity comparisons.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>Honey<\/strong>: The coefficient of viscosity for honey can range from 10 to 20 Pa\u00b7s or higher, depending on factors such as the honey type and the temperature. This high viscosity gives honey its thick and slow-flowing characteristic.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>Motor Oil<\/strong>: The coefficient of viscosity for motor oil has a wide range, from 20 to 100 centistokes (cSt) or higher. Motor oil is designed to have a higher viscosity compared to water and this ensures effective lubrication of engine components. Higher-viscosity oils have higher coefficients of viscosity.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>Air<\/strong>: Gases also have a coefficient of viscosity. The coefficient of viscosity for air at atmospheric pressure or room temperature is approximately 0.000018 Pa\u00b7s or 0.018 millipoise (mP). The viscosity of gases is considerably lower than that of fluids and this low viscosity allows air to flow easily.<\/span><\/li>\n<\/ol>\n<ol start=\"5\">\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\"> \u00a0 <\/span> <span style=\"font-weight: 400;\"><strong>Molten Glass<\/strong>: The coefficient of viscosity for molten glass can range from around 10^2 to 10^8 Pa\u00b7s, indicating a high resistance to flow. And this depends on its temperature and composition.<\/span><\/span><\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"The_Coefficient_of_Viscosity_Using_Stokes_Method\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>The Coefficient of Viscosity Using Stoke&#8217;s Method<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Stoke&#8217;s method or Stoke&#8217;s law is a mathematical equation that expresses the velocities of the small spherical objects in a fluid medium and says that any object when rises or falls through a fluid it will experience a frictional or drag force because of the fluid.\u00a0<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-2581 aligncenter\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/stoke_s-law.jpg\" alt=\"Stoke's Method\" width=\"486\" height=\"637\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/stoke_s-law.jpg 741w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/stoke_s-law-229x300.jpg 229w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0In other words,\u00a0 Stoke&#8217;s law states that the force of viscosity on a small sphere moving through a viscous fluid is given by the following equation:<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\"><br \/>\n<\/span><strong> F=6\u03c0\u03bcrv<\/strong><\/span><\/p>\n<ul>\n<li style=\"text-align: left;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong><br \/>\n<\/strong><span style=\"font-weight: 400;\"> Where:<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> F is the frictional force acting on the interface between the fluid and the particle. <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> \u03bc is the dynamic viscosity.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> r is the radius of the spherical object.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> V is the flow velocity relative to the object.<\/span><\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Importance_of_Stokes_Law\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Importance of Stoke\u2019s Law<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Stoke&#8217;s law is important in explaining the formation of clouds, the falling from a parachute, why the larger rain droplets hurt more than the smaller ones, and more.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Millikan depended on the concept of Stokes&#8217; law in his oil-drop experiment, which was used to determine the electronic charge.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>PraxiLabs, the 3D virtual lab solution, provides students with access to realistic biology, chemistry, and physics labs and enriches their understanding with a variety of informational and educational content .. <a href=\"https:\/\/praxilabs.com\/en\/pricing\">Pick the best plan for you now!<\/a><\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Stokes_Law_Derivation\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Stoke\u2019s Law Derivation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2580 aligncenter\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Coefficient-of-Viscosity-Using-Stoke_s-Method.png\" alt=\"Stoke\u2019s Law Derivation\" width=\"595\" height=\"447\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Coefficient-of-Viscosity-Using-Stoke_s-Method.png 960w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Coefficient-of-Viscosity-Using-Stoke_s-Method-300x225.png 300w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Coefficient-of-Viscosity-Using-Stoke_s-Method-768x576.png 768w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The viscous force acting on a sphere is directly proportional to the following factors:<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Coefficient of viscosity (\u03b7) as <\/span><b>F <\/b><b>\u221d<\/b><b> \u03b7<\/b><b>a <\/b><b>\u00a0\u2026(i)<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">The radius of the sphere (r) as <\/span><b>F <\/b><b>\u221d<\/b> <b>\u00a0<\/b><b>r<\/b><b>b <\/b><b>\u2026(ii)<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">The velocity of the object (v) as <\/span><b>F <\/b><b>\u221d<\/b><b> v<\/b><b>c<\/b><b> \u2026(iii)<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Combining the above three equations we get,<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>F <\/b><b>\u221d<\/b><b> \u03b7<\/b><b>a <\/b><b>r<\/b><b>b <\/b><b>v<\/b><b>c<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Removing the proportionality sign and adding the proportionality constant k we get.<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>F = k \u03b7<\/b><b>a <\/b><b>r<\/b><b>b <\/b><b>v<\/b><b>c<\/b><span style=\"font-weight: 400;\">\u2026\u2026(1)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Now, equating the dimensions of parameters on either side of equation (1)<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>[MLT<\/b><b>\u20132<\/b><b>] = [ML<\/b><b>\u20131<\/b><b>T<\/b><b>\u20131<\/b><b>]<\/b><b>a<\/b><b> [L]<\/b><b>b<\/b><b> [LT<\/b><b>-1<\/b><b>]<\/b><b>c<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Simplifying the above equation,<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>[MLT<\/b><b>\u20132<\/b><b>] = [M<\/b><b>a<\/b> <b>\u22c5<\/b><b> L<\/b><b>\u2013a+b+c<\/b> <b>\u22c5<\/b><b> T<\/b><b>\u2013a\u2013c<\/b><b>]<\/b><span style=\"font-weight: 400;\">\u2026\u2026(2)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Equating the superscripts of mass, length, and time respectively from equation (2), we get<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>a = 1 <\/b><span style=\"font-weight: 400;\">\u2026.(a)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u2013a + b + c = 1 \u2026\u2026(b)<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u2013a \u2013c = 2<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">a + c = 2 \u2026\u2026(c)<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">from (b), (c)<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">1 + c = 2<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>c = 1<\/b><span style=\"font-weight: 400;\">\u00a0 \u2026\u2026(d)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">from (a) &amp; (b) in (d), we get<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u20131 + b + 1 = 1<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>b = 1<\/b><span style=\"font-weight: 400;\"> \u2026\u2026(e)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">From (a), (d), and (e)<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>F = k \u03b7 r v<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">For any spherical body, the value of k was experimentally obtained to be 6\u03c0.\u00a0<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Thus, the viscous force on a spherical body falling through a liquid is given by the equation, <\/span><b><i>F = 6\u03c0\u03b7rv<\/i><\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><a href=\"https:\/\/www.geeksforgeeks.org\/stokes-law\/\" target=\"_blank\" rel=\"noopener\">Source<\/a><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Determination_of_the_Coefficient_of_Viscosity_by_Stokes_Method_Experiment_From_PraxiLabs\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Determination of the Coefficient of Viscosity by Stoke&#8217;s Method Experiment From PraxiLabs<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2586 aligncenter\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determination-of-the-Coefficient-of-Viscosity-by-Using-Stokes_s-Method1_23_2022_7_06_09_AM.jpg\" alt=\"Determination of the Coefficient of Viscosity by Stoke's Method Experiment From PraxiLabs\" width=\"800\" height=\"450\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determination-of-the-Coefficient-of-Viscosity-by-Using-Stokes_s-Method1_23_2022_7_06_09_AM.jpg 800w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determination-of-the-Coefficient-of-Viscosity-by-Using-Stokes_s-Method1_23_2022_7_06_09_AM-300x169.jpg 300w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determination-of-the-Coefficient-of-Viscosity-by-Using-Stokes_s-Method1_23_2022_7_06_09_AM-768x432.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/span><\/p>\n<p><span style=\"font-size: 18pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>PraxiLabs provides a <a href=\"https:\/\/praxilabs.com\/en\/3d-simulations\/determination-of-coefficient-of-viscosity-by-stokes-method\">virtual lab simulation for the experiment (Determination of the Coefficient of Viscosity by Stoke&#8217;s Method)<\/a><\/strong><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Learning_Objectives\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><strong>Learning Objectives<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>By the end of the determination of the coefficient of viscosity using Stoke&#8217;s method experiment, the students should be able to:<\/b><\/span><\/p>\n<ol>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Understand the definition of the viscosity.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Detect the CGS and MKS (SI) units for measuring the coefficient of viscosity.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Explain the origin of the viscosity in both liquids and gases.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Estimate the temperature effect on the coefficient of viscosity for fluids and enumerate the other different factors that could change the viscosity of a liquid.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Set up an experiment to measure the coefficient of viscosity of liquids.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>In this experiment, we will need:<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Cylindrical glass jar \u2013 Steel balls of different radii \u2013 Highly viscous liquids &#8211; Ruler \u2013 Stopwatch.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">The experiment of determination of the coefficient of viscosity depends on measuring the fall-terminal speed of a metal sphere that falls in a glass jar filled with a viscous fluid, as a function of the sphere\u2019s radius. Hence the viscosity coefficient of the liquid can be readily determined.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>PraxiLabs provides properties of matter virtual labs to students and educators that include a set of hands-on experiments designed to support students\u2019 understanding of the principles of physics. <\/b><a href=\"https:\/\/praxilabs.com\/en\/request-free-demo\"><b>Request free demo!<\/b><\/a><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Theoretical_Background\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Theoretical Background<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2584 size-full\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determining-the-Coefficient-of-Viscosity-Using-Stoke_s-Method.png\" alt=\" How to Determine the Coefficient of Viscosity Using Stoke's Method \" width=\"750\" height=\"462\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determining-the-Coefficient-of-Viscosity-Using-Stoke_s-Method.png 750w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/Determining-the-Coefficient-of-Viscosity-Using-Stoke_s-Method-300x185.png 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Consider a steel ball of radius (r) is released from the top of a glass jar filled with a viscous fluid with viscosity coefficient (\u03b7). The instant the ball hits the liquid\u2019s surface, it stops momentarily and then begins to accelerate downward under the effect of gravity.<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">At the same time, the so-called viscous force ( F<\/span><span style=\"font-weight: 400;\">v<\/span><span style=\"font-weight: 400;\">) begins to oppose the motion of the ball, as it depends directly on the speed of the ball <\/span><span style=\"font-weight: 400;\">(see eq.(3)).<\/span><span style=\"font-weight: 400;\"> As time goes on, the viscous force (which is also called the drag force or Stoke\u2019s force) increases in magnitude until it reaches a value together with the buoyant force that balances the weight of the ball.<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Theory In such a case, the ball moves with a constant speed called the terminal velocity ( v<\/span><span style=\"font-weight: 400;\">o<\/span><span style=\"font-weight: 400;\"> or sedimentation velocity). Before reaching the bottom of the jar, the ball decelerates and eventually comes to a stop. This means that within a certain length of the jar away from its ends (both are marked on the glass jar with two marks A and B), the ball moves with a uniform speed, under the effect of three balanced forces:<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>1- The Ball Weight<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2588 aligncenter\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq1.png\" alt=\"Eq.1\" width=\"609\" height=\"98\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq1.png 609w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq1-300x48.png 300w\" sizes=\"auto, (max-width: 609px) 100vw, 609px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Where:<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">\u00a0m<\/span><span style=\"font-weight: 400;\">ball<\/span><span style=\"font-weight: 400;\"> is the mass of the ball<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0g is the acceleration due to gravity<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">\u00a0V<\/span><span style=\"font-weight: 400;\">ball<\/span><span style=\"font-weight: 400;\"> is the volume of the ball.<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">And \u03c1<\/span><span style=\"font-weight: 400;\">ball<\/span><span style=\"font-weight: 400;\"> is the density of the ball\u2019s material.<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>2- Upthrust force (or the buoyant force)<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Upthrust force is the force exerted by the fluid on the immersed body and acting upward. Recall that the buoyant force equals the weight of the immersed body:<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2591\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq2.png\" alt=\"eq\" width=\"221\" height=\"73\" \/><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Where \u03c1<\/span><span style=\"font-weight: 400;\">liquid<\/span><span style=\"font-weight: 400;\"> is the density of the liquid\u2019s material. However, since the volume of immersed body V<\/span><span style=\"font-weight: 400;\">ball<\/span><span style=\"font-weight: 400;\"> equals the volume of displaced liquid V<\/span><span style=\"font-weight: 400;\">liquid<\/span><span style=\"font-weight: 400;\">,<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2589\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.2.png\" alt=\"eq.2\" width=\"602\" height=\"81\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.2.png 602w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.2-300x40.png 300w\" sizes=\"auto, (max-width: 602px) 100vw, 602px\" \/><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>3- Viscous force<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">Viscous force acting the ball due to the viscosity of the liquid <\/span><span style=\"font-weight: 400;\">?<\/span><span style=\"font-weight: 400;\">, acts upward,<\/span><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2590\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq3.png\" alt=\"eq.3\" width=\"623\" height=\"43\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq3.png 623w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq3-300x21.png 300w\" sizes=\"auto, (max-width: 623px) 100vw, 623px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">However, when the ball moves with the terminal velocity vo , the net force acting on the ball is zero; then<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2593\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq4.png\" alt=\"eq4\" width=\"476\" height=\"129\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq4.png 476w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq4-300x81.png 300w\" sizes=\"auto, (max-width: 476px) 100vw, 476px\" \/><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Effect of the Jar\u2019s Wall<\/b><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">To take into account the proximity of the jar\u2019s wall which affects the motion of the ball, the terminal speed vo can be calculated to the first approximation using the relation<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2592\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.4.png\" alt=\"eq.4\" width=\"481\" height=\"60\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.4.png 481w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.4-300x37.png 300w\" sizes=\"auto, (max-width: 481px) 100vw, 481px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">Where R is the inner radius of the jar and v is the measured velocity.<\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Effect of Temperature<\/b><\/span><\/p>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">The viscosity coefficient depends on the fluid&#8217;s temperature. As the temperature increases, <\/span><span style=\"font-weight: 400;\">the coefficient of the viscosity <\/span><span style=\"font-weight: 400;\">decreases for liquids and increases for gases.<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">This can be interpreted according to the origin of viscosity in both. For liquids, the viscosity originates from the frictional force between adjacent layers when they move past each other, therefore increasing temperature, and causes the separation distance between layers to increase and the viscosity decrease.<\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">\u00a0On the other hand, in gases, the viscosity originates from the collisions made by the gas molecules with each other within the same layer. Increasing the temperature causes these collisions to increase and the viscosity increases as well.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"The_steps_of_the_Experiment\"><\/span><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>The steps of the Experiment<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">In PraxiLabs virtual lab of the determination of <\/span>Coefficient of Viscosity Using Stoke&#8217;s Method experiments, you will do the following steps to conduct the experiment successfully<\/span><\/p>\n<ol>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Choose a liquid from the drop list, such as glycerin.<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Select the ball\u2019 radius from the slide bar.<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Adjust the distance between the two movable marks \u201cA\u201d and \u201cB\u201d (10 \u2013 90 cm).<\/span><\/li>\n<li><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Click on the \u201cDrop Ball\u201d button to drop the solid ball inside the jar. When the ball reaches the mark \u201cA\u201d, Click the \u201cStart\u201d button to start the stopwatch.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> When the ball (inside the red circle) reaches the mark \u201cB\u201d, click the \u201cStop\u201d button. 6. Click the \u201cRecord\u201d button to record this time.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Click the \u201cNew Trial\u201d button to start over with the same ball if you want.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Repeat the previous steps for all the available ball\u2019 radii.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> The experiment has ended, an Excel sheet will be downloaded that contains the data you\u2019ve recorded.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> You will calculate r (m) and r 2 (m2) \/ the apparent speed of the ball \/ the terminal speed of the ball.<\/span><\/li>\n<li><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"> Plot a relation between vo and r 2 , which should yield a straight line that passes through the origin, then calculate the slope of the line.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2582 aligncenter\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/plot.png\" alt=\"relation between vo and r 2 ,\" width=\"287\" height=\"222\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400; font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\">11. Finally, Calculate the viscosity coefficient of the chosen liquid using the following relation:<\/span><\/p>\n<p><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2594\" src=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.5.png\" alt=\"eq.5\" width=\"381\" height=\"150\" srcset=\"https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.5.png 381w, https:\/\/praxilabs.com\/en\/blog\/wp-content\/uploads\/2023\/08\/eq.5-300x118.png 300w\" sizes=\"auto, (max-width: 381px) 100vw, 381px\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 14pt; font-family: tahoma, arial, helvetica, sans-serif;\"><b>Now, you can easily conduct (determination of the Coefficient of Viscosity by Stoke&#8217;s Method Experiment) on your own for free. <a href=\"https:\/\/praxilabs.com\/en\/sign-up\">Create your free account and try it now<\/a>!<\/b><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imagine that you have a cup with a hole in the bottom. If you pour honey or glycerin into the cup, you will find that the cup drains very slowly. But in the case of water, the cup will drain much more quickly. That happens because &#8220;viscosity&#8221; is higher in the case of honey or &hellip;<\/p>\n","protected":false},"author":8,"featured_media":4503,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"no","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2587","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-virtual-learning"],"modified_by":"Muhamed Elmesery","_links":{"self":[{"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/posts\/2587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/comments?post=2587"}],"version-history":[{"count":10,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/posts\/2587\/revisions"}],"predecessor-version":[{"id":5185,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/posts\/2587\/revisions\/5185"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/media\/4503"}],"wp:attachment":[{"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/media?parent=2587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/categories?post=2587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/praxilabs.com\/en\/blog\/wp-json\/wp\/v2\/tags?post=2587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}