latent heat of vaporisation
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The enthalpy of vaporisation is also known as latent heat of vaporisation.
vaporisation or heat of evaporation , is the amount of energy (enthalpy) that must be added to a liquid substance into a gas .The enthalpy of vaporisation is a function of the pressure in which that transformers takes place.
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A single-component system containing two phases (gas and liquid) in equilibrium has one degree of freedom. It is thus completely specified by a single independent variable, usually the temperature. The remaining equilibrium state variables, vapor pressure ps, and the molar volumes of the two coexisting phases and follow from the combination of thermodynamic equilibrium criteria and the equation of state applied to the two coexisting planes. The latent heat of vaporization ΔH corresponds to the amount of energy that must be supplied to the system to convert a unit amount of substance from the liquid to the vapor phase under conditions of equilibrium between the two phases. This transition thus always occurs at constant temperature and the corresponding vapor pressure, ps.
Methods for the determination of heats of vaporization have been critically evaluated by Majer et al. (1989) who have also summarized methods for estimating quantity. Majer and Svoboda (1985) have given an extensive critical review and data compilation for the heats of vaporization of organic compounds.
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