A question on Twitter | Tim Worstall

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SaxLegs McGinty
@RuairiPCharles
Why do kettles shut up before boiling?

Hmm, good.

So, um, why? A first hypothesis would be that the noise during heating is the dissolved gas that is expelled: does it make sense? Dissolving solids in liquids may be easier as the temperature rises, but do gases work the other way around? – and then the actual boiling is the creation of steam. But is there that small gap between the end of the expelled gases and the start of steam production?

This is obviously a question whose answer has already been found. So, is this one where the first assumptions lack a vital fact that thereby makes a mockery of them?

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