Question

Which phenomenon occurs during the following changes (1)formation of cloud, (2)drying of wet clothes, (3)wax melts in the sun, (4)size of naphthalene ball decrease

Answer 1

1 st one is condensation

2 nd one is evaporation

3 rd one is melting

4 th one is sublimation


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Answer 2

Explanation:

When water vapour present in the atmosphere or air condenses in the form of water droplets then it results in the formation of clouds.

Therefore, phenomenon for formation of clouds is known as condensation.

Drying of wet clothes is a phenomenon called vaporization as liquid state of water changes into gaseous state.

When wax melts in the sun then this phenomenon is called melting.

When solid state of matter changes directly into vapour state without undergoing liquid state then this phenomenon is known as sublimation.

Therefore, size of naphthalene ball decrease due to sublimation phenomenon.