The phase change that does not involve changing a liquid into a gas is freezing.

Here's why:

* Freezing: A liquid changes into a solid.

* Melting: A solid changes into a liquid.

* Boiling/Evaporation: A liquid changes into a gas.

* Condensation: A gas changes into a liquid.

* Sublimation: A solid changes directly into a gas (skipping the liquid phase).

* Deposition: A gas changes directly into a solid (skipping the liquid phase).