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	Why are bubbles round?
	Dave: That’s because a bubble is made up of a very thin layer of water which has soap molecules on the outside and that has surface tension. It’s trying to minimise its area and get as small as possible. The best shape with the smallest surface for a certain volume of air inside is a sphere, so they’re round.
	November 2007

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Listen to this as part of the show: 11th Nov 2007 - Naked Science Q&A
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