Evaporation is a process, not a state of matter like liquid or solid. It's the process by which a liquid changes into a gas.

Here's a breakdown:

* Liquid: The initial state of matter undergoing evaporation.

* Evaporation: The process itself, where liquid molecules gain enough energy to escape into the air as a gas.

* Gas: The final state of matter after evaporation.

So, evaporation is the change from a liquid to a gas, not a substance in itself.