Question

What do you mean by vapour and gaseous state of substance?

Answer 1

A gas refers to a substance that has a single defined thermodynamics state at room temperature whereas a vapours refers to substance that is a mixture of two phases at room temperature....... I hope it help

Answer 2

Vapour of a substance means when the given substance convert into tiny droplets and floating in the atmosphere. Gaseous state of a given substance means when the substance is converted into gas.