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	Why does water bubble when it boils? Bill in Cambridge
	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.
	February 2007

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Listen to this as part of the show: 4th Feb 2007 - Pain relief - the contributions of genes, spider venom and chillies
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