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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site enthalpy A thermodynamic property of a substance, defined as the sum of its internal energy plus the pressure of the substance times its volume, divided by the mechanical equivalent of heat. The total heat content of air; the sum of the enthalpies of dry air and water vapor, per unit weight of dry air; measured in calories per kilogram (or BTU per pound). Related categories    • BASIC SCIENCE Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP