The enthalpy of vaporization is often quoted for the normal boiling temperature of the substance. Source Wikipedia
The enthalpy of vaporization is a function of the pressure at which that transformation takes place. Source Wikipedia
The enthalpy of vaporization (symbol ∆Hvap), 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. Source Wikipedia
