latent heat是甚麼?

latent heat is the energy required to change the state of a substance of 1kg.

latent heat of vaporiation is the energy required to change the substance from liquid to gas or gas to liquid.
latent heat of fusion is the energy required to change the substance from solid to liquid or liquid to solid.

latent heat=潛熱

energy required to change the state of a substance, without changing its temperature.