Thermal capacities of organic compounds : Defining thermal capacities

Defining thermal capacities
Thermal capacities of organic compounds

Authors : Louis SCHUFFENECKER, Jean-Noël JAUBERT

Review date: December 5, 2016 | Lire en français

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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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