Physics
Pressure Cooker cooks faster because

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

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
Weight of the balloon is less than the weight of air displaced by it.
The pressure inside the balloon is more than the pressure outside it

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