Liquid turns into a gas or vapor through a process called vaporization.

Here's a breakdown:

* Vaporization: This is the general term for the change of state from liquid to gas.

* Evaporation: This is a slow process of vaporization that occurs at the surface of a liquid. It happens when liquid molecules gain enough energy to escape the liquid's surface and become gas molecules.

* Boiling: This is a faster process of vaporization that occurs throughout the entire liquid. It happens when the liquid reaches its boiling point, where the vapor pressure equals the atmospheric pressure.

So, while both gas and vapor refer to the gaseous state of matter, vapor is often used to specifically describe the gaseous state of a substance that is normally a liquid at room temperature.

Let me know if you have any other questions!