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Change of StatePlay
The term 'vapour' is used when a substance changes from solid or liquid to gas. SlideThe boiling kettle released a stream of vapour.
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Visible GasPlay
'Vapour' often refers to gas that you can see, like steam or fog. SlideThe cold air turned his breath into a vapour.
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Not Always WaterPlay
While it's often water, 'vapour' can be any liquid or solid turned gas. SlideGasoline vapour can be highly flammable.