differentiate between gas and vapour?
| 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. |