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NTSE
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Difference between Gas and Vapour
Usually there is no difference between gas and vapour. The term ‘vapour’ is used for those gases which exist in the liquid form at room temperature. For example, the gaseous form of water is called vapour. On the other hand, hydrogen, oxygen, nitrogen, carbon dioxide etc exist as gases at room temperature. Hence, each one of these is called a ‘gas’, not a vapour.