Why can we see liquids and solids but not gases?

the atom and molecules in gases are much more separate out then is solid or liquid they vibrate and move freely at high speed a gas will fill any container but if the in the continent is not seald the gas will escape gas can be compressed more easily the liquid or soild

A slid has a definite shape and a definite volume. A liquid has no definite shape but a definite volume. A gas has no definite shape or volume