Physics
Water boils at a lower temperature on the hills because

There is less carbon dioxide on the hills
There is less oxygen
It is cold on the hills
There is a decrease in air pressure on the hills

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Physics
Pressure Cooker cooks faster because

Boiling point decreases with rise of pressure
The material of the cooker is a good conductor
It cooks the food at low pressure
Higher temperature is attained for cooking

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