Question

Explain, why the bubbles of a gas in a boiling liquid generally increase in volume as they approach the upper surface ?

Answer 1

See,
The process of boiling is often considered isothermal so the equation
PV=pv holds if the depth is not too much.

we know that at the lower surface pressure is greater than atmospheric pressure, so as to follow the above equation, when the bubble comes up, its volume increases as the pressure decreases..


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Answer 2

When you begin to boil water first, the "bubbles" you see are essentially air bubbles. These are "bubbles" formed from the gases dissolved that appear "out of the solution", so if the "water" is in a "different atmosphere", the bubbles can also made out from them.  

The bubbles of a gas in a boiling liquid generally increase in volume as they approach the upper surface because on approach of the upper surface, the pressure on them decreases, and hence, volume increases.