Question

To show the presence of water vapour in the air give reason why tumbler should be cleaned and dried completely from outside

Answer 1

The tumbler has to be dry and cleaned so that there is no misinterpretention for the observation.

Experiment to show the presence of water vapour in the atmosphere;

• Take a clean dried tumbler.
• Fill it with ice and ice-cold water

Observation;

• Water droplets on the surface of the tumbler are seen.

Conclusion:

• Water vapour is present in the atmosphere as due to coldness of the tumbler (ice-cold) the water vapour got condensed into water droplets and were seen on the surface.

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