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Physics · Glossary

What is Enthalpy; heat capacities?

Definition 22.6 University Physics — Year 1 · Chapter 22 — The First Law of Thermodynamics

The enthalpy H=U+PVH = U + PV is a state function adapted to transformations at constant pressure. The heat capacities at constant volume and pressure are

CV=(∂U∂T)V,CP=(∂H∂T)P,C_V = \left(\frac{\partial U}{\partial T}\right)_V, \qquad C_P = \left(\frac{\partial H}{\partial T}\right)_P ,

in J/K\mathrm{J}/\mathrm{K}; per mole CV,mC_{V,m}, CP,mC_{P,m}; per kilogram the specific heats cVc_V, cPc_P.

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