Advertisements
Advertisements
प्रश्न
How will you demonstrate that water vapour is present in air ?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Evaporation takes place from the
Explain why in hot summer days water remains cool in earthen pots.
Which produces more severe burns : boiling water or steam ? Why ?
Define the following terms Condensation
Why does our palm feel cold when we put some acetone (or perfume) on it ?
Why does evaporation cool a liquid ?
Give a geographical reason:
Air becomes saturated.
Can you suggest a method to collect water from sea water?
Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? Explain.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
