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Water is a liquid. When you heat it, it moves around a lot faster. When the water reaches 100 degrees Celsius, it turns into a gas called water vapour.This gas is lighter* than the water around it, so it rises to the top. Then it escapes into the air. As more and more of the water turns into gas, more of it disappears into the air. After a while, every last drop of the water will be gone.

* Actually, the correct statement is that the gas is less dense than the water around it.

Most of the bubbles start at the bottom, because that's where the heat is. The more heat you apply, the more bubbles you will get. The water is turning into a gas very quickly, and lots of bubbles form, and all try to rise to the surface at once. They push the water out of the way as they rise, and jump out of the surface. This is what we call 'boiling water'.

So basically, the boiling point and below, the water stops moving so rapidly to produce bubbles.

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14y ago

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