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The Enthalpy of vaporization , also called the latent heat of vaporization is the change in the enthalpy needed to change an amount of liquid into a gas .

The enthalpy of vaporization , ( symbol ∆ " H " ) also known as the ( latent ) heat of vaporization or heat of evaporation , is the amount of energy ( enthalpy ) that must be added to a liquid substance , to transform a quantity of that substance into a gas .