Vapour term cannot be used for which of the following gases? 1. H2 2. N2 3. CO2 4. All of?

... these or:... theseor:In physics a vapor (American) or vapour (British) is a substance in the gas phase at a temperature lower than its critical

... these

or:... these

or:In physics a vapor (American) or vapour (British) is a substance in the gas phase at a temperature lower than its critical temperature,[1] which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature.en.wikipedia.org/wiki/VaporYou will need to study this page for a while to answer the question.

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