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What is enthalpy?
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.
For more information check out this web-site:
enthalpy


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