Question

Difference between vapour and gas? ✌✌

Answer 1

A gas refers to a substance that has a single defined thermodynamic state at room temperature whereas a vapor refers to a substance that is a mixture of two phases at room temperature, namely gaseous and liquid phase.
In simple words,
A gas is like a homogeneous mixture. - even all over and in single phase.
While vapour is like a heterogeneous mixture containing both liquid and gaseous phase.

Answer 2

Gas is the gaseous state of an element/compound which exist as gas in room temperature i. e. 25 degree Celsius
Ex : Oxygen, Hydrogen, Carbon dioxide, Methane
Vapour is the gaseous state of an element /compound which exist in gaseous state above the room temperature. i. e. Above 25 degree Celsius.
Ex : Water vapour, Gaseous state of Ammonium Chloride, etc