Why does pasta water more readily boil over (and out of the pot) when it’s covered vs when it’s uncovered?
In: Chemistry
Bubbles disappear because they dry out, losing their structural integrity until they pop.
When your pot is covered humidity doesn’t escape as much, and in a humid environment bubbles don’t dry as much. With actual condensed water in the air (that otherwise would just rise away from the bubbles) you have water coming in the bubbles, so they don’t lose water as fast.
More bubbles appearing while the existing ones don’t disappear as fast is how your pot boils over.
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