Question

Why bubbles are formed at the bottom of the vessel

Answer 1

Atmospheric gases such as nitrogen and oxygen can dissolve in water. ... When you draw a glass of cold water from your faucet and allow it to warm to room temperature, nitrogen and oxygen slowly come out of solution, with tiny bubbles forming and coalescing at sites of microscopic imperfections on the glass.

Answer 2

Hi..

What we see as boiling is actually liquid molecules getting enough energy to become a gas and then conglomerating into bubbles. When the bubbles get big enough they rise to the surface and we see boiling.

These bubbles can form two ways, by themselves in the bulk of the liquid (high energy) or on some surface (much lower energy), and so they like to form on surfaces first. Also, when you are heating a pot of water the layer of liquid at the pot surface is the hottest part. The bubbles you see are then forming for two reasons: that extra heat causes gas bubbles to form earlier than the rest of the liquid and the surface gives them something to form on.

Hope it helps you. :-)

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