In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

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 .
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 .