Energy exchange can change potential energy, translational kinetic energy, and heat energy and change pressure and volume {enthalpy}|. Enthalpy equals total system energy E plus product of pressure P times volume V: H = E + P*V. Pressure times volume is work. Under constant pressure or volume, enthalpy is heat that system makes. For solids or liquids, enthalpy equals energy, because volume does not change.
Physical Sciences>Physics>Heat>Energy
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Date Modified: 2022.0224