Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at the top of Mt. Everest
at sea level
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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Physics
The law of conservation of energy states that

Energy can either be created or destroyed
Energy can either be created nor destroyed
Energy can neither be created nor destroyed
Energy can neither be created or destroyed

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