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Question
Describe simple experiments to show the presence of -
water vapour in air using a glass tumbler and ice.
Solution
Water vapour in air:
Apparatus- A clean dry beaker ,cube of ice
Procedure-
- Take a clean glass beaker dried from outside and place pieces of ice in it.
- Keep the beaker with the ice, aside for sometime.
Observation-
- Tiny droplets of water appear on the outer surface of the beaker, which can be proved by using a dry blue cobalt chloride paper. It turns pink in the presence of water.
Conclusion-
- The constituent of air-water vapour- condenses on the cooler surface of the beaker, proving that air contains water vapour.
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