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Article | REF: K550 V1

Thermal capacities of organic compounds

Authors: Louis SCHUFFENECKER, Jean-Noël JAUBERT

Publication date: October 10, 1994, Review date: December 5, 2016

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1. Defining thermal capacities

When a closed system receives, at constant volume, a quantity of heat Q V , its change in internal energy ΔU is equal to this quantity of heat :

ΔU = U (final) – U (initial) = Q V ( 1 )

When a closed system receives, at constant pressure, a quantity of heat Q P , its enthalpy variation ΔH is equal to this quantity of heat :

ΔH = H (final) – H (initial) = Q P ( 2 )

The definition of thermal capacity is very general...

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