Question

when the water is boiled the size of air bubbles increase in size as they rise up. Give reason.

Answer 1

Because, water contains particles, whose boiling points are less than that of water, hence all the particles changes as gasses before water and a bubble and goes on increasing its size, soon they are popped and comes into atmosphere
This is what I know, I think this is a proper reason

Answer 2

On increasing temperature, increases vapours and increases vapours then increases gasses and when increases gasses then increase vol. Of bubbles with gasses.