Question

Water vapor is water as a: solid, liquid, or gas?

Answer 1

Terminology

Explanation:

Gas state is generally a term used to describe the elements in gas phase while Vapour is a term used to describe compounds in their gas phase.

For (e.g)
Nitrogen Gas, `NO_2` vapour, `PH_3` vapour, `NH_3` vapour.

Special cases like synthetic gas etc exist. But these are mixtures of compounds in their corresponding gaseous state.

Hence Water vapour is Water in gaseous state.