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InterviewSolution
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Write the formula for specific heat. Hence, obtain its unit. |
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Answer» Specific heat of a substance, C = \(\cfrac{Q}{m(T_f-T_i)}\), where m is the mass of the substance and Q is the amount of heat supplied to the substance to increase its temperature from Ti to Tf. ∴ Unit of specific heat = \(\cfrac{Unit\,of\,heat\,(energy)}{Unit\,of\,mass\times Unit\,of\,temperature}\) The SI unit of heat is the joule (J), that of mass is kg and that of temperature is kelvin (K). ∴ The SI unit of specific heat = \(\cfrac{J}{(kg.K)}\) [Note: Specific heat is also expressed in J/(kg°C) and cal/(g°C).] |
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