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Boiling converts the liquid water to water vapor. The bubbles are the water vapor escaping. As substances warm up, they become less dense, and the less dense something is, the less mass it has, so the water vapour rises to the top. Water in a pan or kettle bubbles like this because the source of heat is at the bottom, so the water near the bottom boils first. If you could somehow heat something from the top down, it probably wouldn't bubble.
Water vapor is formed at the heated surface, and tends to coalesce on nucleation sites like an inflating balloon until it is carried to the free surface and released.

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12y ago

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