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CBSE Class 9 Answered

differentiate between gas and vapour?
Asked by mohammad anas ghori | 05 Sep, 2013, 02:43: PM
Expert Answer

Vapour

Gas

A substance which under ordinary conditions is a solid or a liquid but under specific conditions is gaseous is called vapour.

When a substance exists in the gaseous state under ordinary conditions that is, at room temperature and  one atmospheric pressure, it is called a gas.

A vapour is a substance which has experienced a phase change.

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

Vapour 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.

A vapour is a substance above its boiling point temperature.

A gas is a substance above its critical temperature.

Example: Iodine is a solid under ordinary conditions, but when it is heated, it changes into its gaseous state in the form of iodine vapours.

Example: Oxygen, Nitrogen, Chlorine.

Answered by Hanisha Vyas | 05 Sep, 2013, 05:53: PM
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