latent heat
noun [ U ] physics specialized uk/ˈleɪ.tənt ˌhiːt/ us/ˈleɪ.tənt ˌhiːt/
潜热（物质的形式发生变化，如从液体变为气体时，吸收或放出的热量。在此过程中，温度不发生变化。）
the heat that is absorbed or released by a substance when it changes state, for example from a liquid to a gas, while the temperature of the substance does not change