Question

why liquid starts evaporating before it reaches its boiling point?

Answer 1

As a liquid is heated, its molecules absorb heat and move faster.When the liquid starts to boil, bubbles of vapour form within the liquid and rise to the surface.
Evaporation and boiling both happen when water is heated. When bubbles form in liquid, it hasreached its boiling point and evaporates.

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Answer 2

liquid starts evaporation before it reaches to boiling point becausesunligh hot fire