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What is enthalpy?
Question Date: 2004-05-11
Answer 1:

Enthalpy (H) is the sum of the internal energy (E)plus the product of the pressure multiplied by the volume of the gas in a system:
H = E + PV.
Though sometimes termed "heat content,'' the enthalpy in fact includes energy not contained in the system. Enthalpy proves convenient for describing processes in gases and liquids in laboratory environments.
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