The process where a gas is converted directly to a solid without passing through the liquid phase is called deposition.

This is the opposite of sublimation, where a solid goes directly to a gas.

Here are some examples of deposition:

* Frost formation: When water vapor in the air comes in contact with a cold surface, it can directly deposit as ice crystals, forming frost.

* Snow formation: Snowflakes form in the atmosphere through deposition, as water vapor directly freezes onto ice crystals.

* Thin film deposition: This is a common technique in manufacturing, where thin layers of a material are deposited onto a surface in a vacuum chamber. The material is vaporized and then deposited as a solid layer on the surface.

Let me know if you'd like more details about any of these!