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Question
Explain how heat capacity of a solid can be determined by the method of mixture.
Solution
- The solid object whose specific heat is to be determined is heated and then put in water in a calorimeter.
- Solid object loses heat energy to water and calorimeter till temperature of all three become equal.
- According to principle of heat exchange,
Heat lost by a solid object (Q) = Heat gained by calorimeter (Q1) + Heat gained by water in the calorimeter (Q2)
This means,
mass of the solid object × its specific heat × in its temperature
= (mass of the calorimeter × its specific heat × increase in its temperature) + (mass of the water × its specific heat × increase in its temperature). - Using this equation, if the specific heat of water and calorimeter are known and other physical quantities are measured accurately, the specific heat of solid object can be determined.
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