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प्रश्न
How will you demonstrate that water vapour is present in air ?
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उत्तर
The presence of water vapour in air can be shown by the following experiment:
Take a steel tumbler and put some well-crushed ice into it and wipe its surface with a clean dry cloth, so as to make its surface completely dry. Allow it to stand for 5 minutes. A large number of drops of water vapour appear on the outer surface of the tumbler. This happens because the air around the steel tumbler contains water vapour in it. When this water vapour comes into contact with the cold outside surface of the steel tumbler, it condenses to form tiny drops of liquid water. The formation of tiny drops of water outside the steel tumbler containing crushed ice, shows the presence of water vapour in air.
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संबंधित प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
State three factors which affect the rate of evaporation of a liquid.
Water in a dish evaporates faster than in a bottle. Give reason.
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Define the following terms Condensation
Define the following term Freezing.
Which of the following are also considered to be the states of matter ?
- Plasma
- Platelets
- BEC
- BHC
The amount of vapour in 1 cu.m. of air shows the ______.
Give a geographical reason:
Air becomes saturated.
How does the water kept in an earthen pot remain cool?
