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Steam escapes from a pressure cooker when the pressure inside becomes greater that the weights used on the safety valve in the lid. Excessive escaping steam signals it is time to turn down the gas or electricity slightly. (Otherwise, the pressure cooker would eventually explode if the safety valve was not there to relieve the steam pressure!)

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9y ago
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10y ago

Because it would explode if it didn't .

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Q: Why does steam come out of the pressure cooker the whole time?
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