Question

Differentiate between gas and vapour

Answer 1

A vapor is a substance which has experienced a phase change.
A gas is a substance which has not, and will not experience a phase change.

Vapor is formed by a substance which is a solid or a liquid at room temperature, that its natural state of matter is either a solid or a liquid.
The natural state of matter for a gas is a gas.
Example: steam would be a vapor because at room temperature, it would be water, which is a liquid.
Nitrogen (a gas) at room temperature would still be in a gaseous state, so it is a gas.
Vapour is not a state of matter
Gas is a state of matter
The word, "vapor" suggests a gas that was formed by evaporation of something that is a liquid at room temperature.
While gas is a naturally occuring state of matter.
While a vapor is a substance above its boiling point temperature.
A gas is a substance above its critical temperature

Answer 2

Vapor: 1.. a substance which under ordinary conditions is a solid or a liquid but under specific conditions is in gaseous state is called vapour.

2.. example : water vapours

3.. a vapour is a gas produced by heating a solid or liquid that can return to its liquid or solid state under high pressure at ordinary temperature.

4.. it is considered to be an unstable state and changes to liquid state at room temperature


GAS

1. When a substance exits in gaseous state under ordinary conditions then it is termed as a gas.

2.. example : oxygen, nitrogen, etc.

3.. most of the gases need high pressure and low temperature to return to their liquid or solid state.

4... it is considered to be a stable state. It does not change into liquid easily.