How can you demonstrate the presence of water vapour in air? Answer in brief.
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The presence of water vapour in air can be demonstrated by the following experiment:
We take a steel tumbler and put some well crushed ice in it. Allow the steel tumbler to stand undisturbed for about 5 minutes with the ice in it. We would observe that a large number of tiny drops of water appear on the outer surface of the steel tumbler. 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. This is an icse 9th question I think so
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Activity:
Take ice cubes in a beaker and kept it open place for some time. You will notice that around the beaker there are some water droplets. This droplets formed are due to condensation of water vapor around the beaker. This confirmes the presence of water vapour in air.
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