Explain how cooking at a pressure of 76cm of mercury and temperature of 1000C may be achieved on top of high mountains. 

Cooking pans are fitted with lids that possess safety valves that open when the pressure exceeds 76cmmmHg. During cooking the vapour pressure inside the cooking pan increase and the temperature increases to 100⁰C. the safety valves prevents pressure to exceed  76cmHg and therefore boiling occurs at 100⁰C.

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