How does Gay Lussac's law explain the use of a pressure cooker?

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How does Gay Lussac's law explain the use of a pressure cooker?

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Answer 1 · 2016-01-01T09:59:14

Gay Lusaac's law holds that at constant volume, $P$ $P$ $\propto$ $prop$ $T$ $T$ .

Explanation:

At $1$ $1$ $a t m$ $atm$ pressure we know that the boiling point of water (the temperature at which the vapour pressure of the water is equal to $1$ $1$ $a t m$ $atm$ ) is equal to $100$ $100$ $^{\circ} C$ $""^@C$ .

If we increase the ambient pressure, the boiling point of the water should increase, and indeed it does, so you can cook at temperatures $>$ $>$ $100^{\circ} C$ $100""^@C$ and potentially reduce cooking time. I had a colleague once from Sri Lanka who would cook curries in a pressure cooker - he got beautiful tender meat in an hour or so, rather than the 6-8 hours it would take with a normal saucepan.

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How does Gay Lussac's law explain the use of a pressure cooker?

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