how will you prove that water vapour present in air
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-->The presence of water vapour in air can be demonstrated by the following experiment: ... This happens because the air around the steel tumbler contains water vapour in it. When these water vapour come in contact with the cold, outside surface of steel tumbler, they condense to form tiny droplets of water.
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When the salt is kept in air for a long time, it gets wet. This is becoz of water vapour presents air condenses. This confirms that air contains water vapour.
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