How does gas become solid?

Answer 1

All gases except helium can be frozen solid at a sufficiently low temperature. Helium does not freeze at any temperature, it exists only as either a gas or a liquid.

At low temperatures, gas molecules are moving more slowly, and at some point the attraction between molecules will be greater than the kinetic energy of the random thermal motion; that's why gas can freeze (or in the case of helium, liquefy).

Answer 2

=== === The transition from gas to solid is deposition, where the material goes directly gas-solid with no liquid phase in between.

The opposite (solid-gas) is sublimation, most commonly seen with "dry ice", where solid carbon dioxide directly evaporates as a gas.

This is useful because (a) CO2 is very cold, so it's a good coolant and (b) there's no messy liquid that needs to be contained.

Answer 3

Gas becomes solid through the process of deposition, where gas molecules lose energy and come together to form a solid without passing through the liquid state. This usually occurs when the gas cools down, causing the molecules to slow down and eventually solidify into a crystalline structure.

Answer 4

water vapor turns into ice when it is frozen

Answer 5

carbon turns into dry ice without becoming a liquid first

Answer 6

by sublimation