Solidified gas meaning

[Lily Zello 3I]

Hi! I was reading the textbook and it said that the van Der Waals radius is half the distance between the centers of neighboring atoms in a sample of the solidified gas. What does solidified gas mean? I thought that solid and gas were opposites, so I'm kinda confused.

[Kaya L]

Usually solidified gas is gas that has been dropped to a temperature so low that it freezes. This usually makes the atoms much closer together.

[Tammy Shen 2L]

Dry ice is an example of solidified gas. When carbon dioxide gas reaches an extremely low temperature, it freezes and turns into a solid. The same solidification can apply to other gases.