The phase shift from gas to solid form is called deposition. It's the opposite of sublimation, where a solid directly turns into a gas.

Here's a breakdown:

* Gas: Molecules are far apart and move freely.

* Solid: Molecules are tightly packed and vibrate in fixed positions.

During deposition, gas molecules lose energy, slow down, and become tightly packed together, forming a solid.

Example: Frost forming on a cold window is an example of water vapor (gas) depositing directly into ice (solid).