Question

what is gas?

Answer 1

generically, gas one of the states of matter, the others being solid and liquid - and plasma (basically charged gas). water can be frozen solid, it occurs most naturally as a liquid in the oceans, or it can be vaporised into gas by boiling. i think that if you heat water vapour enough, it becomes plasma - like a gas but with chemical bonding broken and lots of charged particles.

you might however be referring to gas as in the fuel that powers cars etc.

Answer 2

Yes Gas is one of the states of matter but gas is different from vapours which is gaseous state of anything which is not gas at room tempreature.