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Water In The Atmosphere
Question
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How are clouds formed ? Classify them.

Answer

Cloud is a mass of minute droplets of water or tiny crystals of ice formed by the condensation of the water vapour in free air at a considerable elevation. As the clouds are formed at some height over the surface of the earth, they take various shapes. The clouds are classified as under according to their height, expanses, density and transparency.


1. Cirrus: These are formed at high altitudes (8,000–12,000m).

2. Cumulus: They are formed at a height of 4,000–7,000m. They look like cotton.

3. Stratus: They are layered clouds covering large portions of the sky.

4. Nimbus: These are black or dark grey rain clouds. They are very near to the earth’s surface.

 

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Some More Questions From Water In The Atmosphere Chapter

The amount of water vapour actually present in per unit volume of air.

The amount of water vapour actually present in per unit weight of air.

What is relative humidity?

The air that contains moisture to its full capacity.

The transformation of water vapour into water.

The temperature at which condensation starts.

Falling of frozen raindrops and re frozen melted snow on the earth’s surface.

State the common basis of classifying the clouds into three main groups.

State the characteristics of the zonal distribution of relative humidity.

 Explain relative humidity.