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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
State three factors which affect the rate of evaporation of a liquid.
Give two applications of evaporation.
Define the following terms Condensation
Define the following term Freezing.
How can the evaporation of a liquid be made faster ?
What is evaporation ? State the various factors which affect evaporation.
Which of the following are also considered to be the states of matter ?
- Plasma
- Platelets
- BEC
- BHC
The evaporation of water increases under the following conditions :
How is humidity measured?
When lemon juice is mixed with soda water, they produce brisk effervescence.
