When liquid water evaporates into a gas, it's called vaporization.

Here's a breakdown:

* Evaporation: This is the process where a liquid changes into a gas at the surface of the liquid. It occurs at temperatures below the boiling point.

* Vaporization: This is a more general term that refers to the change of state from liquid to gas, regardless of whether it happens at the surface or throughout the entire liquid (like boiling).

So, while evaporation is a type of vaporization, vaporization encompasses all forms of liquid-to-gas transitions.