Why are the air bubbles smaller in size in lower layers but grows bigger as they rise up when water is boiled?

Why are the air bubbles smaller in size in lower layers but grows bigger as they rise up when water is boiled?
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1 Answer

Answer :

Lower layers of water exert a lot of pressure on air bubbles. Hence they are smaller in size. But the pressure decreases as bubbles rise to the top. Hence they grow bigger.
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