1.

Explain the fog, dew and frost.

Answer»

(i) Fog:

  • The temperature of the layers of the air near the surface of the earth reduces. As temperature reduces, water vapour condenses.
  • In this process, vapour turns into microscopic water particles and float in the air. 
  • When the density of these droplets in the air increases, fog occurs.

(ii) Dew:

  • When moisture-laden air near the earth’s surface comes in contact with very cold objects, condensation of the vapour takes place. They turn into very small water droplets. 
  • These water droplets get stick to the surface of the cold objects. This is called dew.

(iii) Frost:

  • If the temperature of the air reaches less than 0°C, the water droplets stuck to the surfaces of cold objects and freeze. 
  • This frozen water droplet is called frost.


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