why is cooking temperature in pressure cooker is higher than that of open pan???

In pressure cooker there is a vent which increases pressure. As boiling point is a temperature at which vapour pressure is equal to atmospheric pressure (external pressure). Now as pressure is increased in pressure cooker so the boiling point increases and therefore cooking temperature is higher in cooker than in open vessel.

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Water boils at a higher temperature when pressurized. In an open pot, the water never gets hotter than 100C (less at higher altitudes). In a pressure cooker, higher temperatures are reached and therefore the food cooks faster.
So in order to cook fast, the temperature is very high in pressure cooker compared to open pan.

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