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blipsman t1_jdvf7zt wrote

The lid retains heat and pressure inside the pot, which causes the water to boil more quickly than if the surface were touching room temp air and the pressure didn't build.

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Chromotron t1_jdvgl5d wrote

The pressure leaves immediately, and so does necessarily some steam. Otherwise that pot would turn into a bomb very very fast. Actually very little pressure is needed to lift the lid up; one atmosphere of pressure is some hundreds of kilograms on a decently sized one, so maybe 1% of that is enough.

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