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High Quality Content by WIKIPEDIA articles! The enthalpy of vaporization, (symbol hvap), also known as the heat of vaporization or heat of evaporation, is the energy required to transform a given quantity of a substance into a gas.It is often measured at the normal boiling point of a substance; although tabulated values are usually corrected to 298 K, the correction is often smaller than the uncertainty in the measured value.The heat of vaporization is temperature-dependent, though a constant heat of vaporization can be assumed for small temperature ranges and below Tr