Newton's law of cooling states that the rate of loss of heat of body is directly proportional to the excess of its temperature from its surrounding.

-This method is only applied to liquids to determine their specific heat. The rate of loss of heat from a body by radiation depends on the following factors:
-Temperature excess between two bodies and their surroundings.
-Area of the body surface.
-Nature of the radiated surface.

-In this experiment, consider two calorimeters of the same metal that have the same dimensions are polished carefully. They both contain two different liquids, one of which has known specific heat, (e.g. water), while the other has unknown specific heat.

-Heat the two liquids up to a temperature and let them cool down. Take the temperature reading as a function of time and draw a graph between time and the recorded temperature.

-If identical ranges of temperature are taken for both liquids, the average rate of heat will be identical, though the average fall rate of temperature will not.

-If the fall rates of temperature are found from the curves of both liquids, then we can find expressions for the rates of heat loss, and by calculating them, we can determine the specific heat of unknown liquid.


Determination of the specific heat of a liquid.

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