Q1.Differentiate between:
a) Gas and Vapour.
(b) Condensation and freezing.
(c) Boiling and evaporation
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(a gas and vapour) A vapour has undergone a phase change while a gas did not. For example, nitrogen is gas in room temperature, but water is liquid. When water is heated, it undergoes a phase change and water vapour forms.Gas is a state of matter while vapour is not.A gas is a substance above its critical temperature but below its critical pressure, while a vapor is a substance above its boiling point temperature.
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Answer:vapours are formed by boiling something but gas can not form by boiling..................... when a solid changes into liquid it is called boiling and by boiling something it changes into gas this is called evaporation
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