Science Questions

Why does water bubble when it boils?

Sun, 4th Feb 2007

Part of the show Pain relief - the contributions of genes, spider venom and chillies

Question

Bill in Cambridge asked:

Why does water bubble when it boils?

Answer

You have an element in your kettle and that gets very hot. Next to that element is water that turns to water vapour, which is 1000 times bigger than water because it's a gas. This bubbles up through the liquid.

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