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| Gas | Vapour | |
| i. | A substance that is in gaseous phase above its critical temperature is called a gas. | A substance that is in gaseous phase below its critical temperature is call vapour. |
| ii. | Gas cannot be liquified only by pressure alone. | Vapour can be liquified simply by increasing pressure. |
| iii. | Gas exerts pressure. | Vapour exerts pressure |
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