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PHY7A Lecture6

# PHY7A Lecture6 - Heat Capacity Definition of heat capacity...

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Heat Capacity Definition of heat capacity: C = Q/ ! T (really C = " Q/dT; i.e. add a very small amount of heat, dQ, and divide by the very small T change that you measure) 1 st Law of Thermodynamics: ! U = Q + W Remember that the internal energy U = E bond + E th If W = 0 AND ! E bond = 0 then ! U = ! E th = Q = C ! T (as you already know)

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Specific Heat Capacity (or just specific heat) Specific heat (use a small c instead of a capital C); divide C by a quantity that measures the size of the material so: Mass specific heat = c mass = C/(mass of material) This is the heat capacity of 1kg of the material (i.e. the increase of E th of 1kg of the material when you change T by 1K) Molar specific heat = c molar = C/(# moles in the material) This is the heat capacity of 1mole of the material (i.e. the increase of E th of 1 mole of the material when you change T by 1K) Specific heat per atom = c atom = C/[(# moles)N A ] This is the heat capacity of 1 atom of the material (i.e. the increase of E th of 1 atom of the material when you change T by 1K)
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PHY7A Lecture6 - Heat Capacity Definition of heat capacity...

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