Question

give the reason for the following (a)what do we say droplets of water on the outer surface of a glass containing Ice cold water (b)after hot sunny day people Sprinkle water on the roof or open grounds

Answer 1

It is due to condensation

Condensation is the phase change from gas to liquid

When a cold soft drink bottle is kept in open air,the water vapour present in the surrounding air condenses on the bottle.

The water molecules are slowed down and stick to the surface is cold.

These water droplets are seen as dew on the surface of the bottle.

We know that evaporation causes cooling because of latent heat of vaporization.

So when water is sprinkled on the hot roof or an open ground after a hot sunny day,it evaporates,thus decreasing the temperature of the surroundings.

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