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Q: Describe about condensation and evaporation
Evaporation involves a liquid changing to a gas, whereas   condensation involves a gas changing to a liquid.

Evaporation happens when the particles in a liquid have different energies.Some will have enough energy to escape from the liquid and become a gas. The remaining particles in the liquid have a lower average kinetic energy than before, so the liquid cools down as evaporation happens.
Example: Damp clothes dry on a washing line.

In condensation, some may not have enough energy to remain as separate particles, particularly if the gas is cooled down. They come close together and bonds form between them. Energy is released when this happens.
Example: Windows become foggy on a cold day.


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