why does a liquid starts bubbling while boiling?

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Solution

Boiling is a phenomenon in which a liquid state changes to the gaseous state. This process take place through the liquid unlike evaporation which occur only at the surface of the liquid.
While boiling, bubbling of liquid is generally observed. This is due to the fact that at boiling temperature, the vapours are formed inside the liquid. Due to the lightness of vapour they have a tendency to uprise in the form of bubbles.

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