Why is the cooking temperature in a pressure cooker higher than in the open pan?
Solution
A liquid boils when its vapour pressure equals the external pressure.
In a sealed pressure cooker the steam raises the pressure above the water, so water must be heated beyond 100°C before its vapour pressure matches it — cooking therefore happens at a higher temperature than in an open pan.
In a sealed pressure cooker the steam raises the pressure above the water, so water must be heated beyond 100°C before its vapour pressure matches it — cooking therefore happens at a higher temperature than in an open pan.
CBSE Class 12 Board · 2002 · Delhi Compartment · Subjective