Question

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Answer 1

manometer is a scientific instrument used to measure gas pressure.

it consists of you shape tube with one end open to the atmosphere

when gas is added it will exert pressure on Mercury on the other end.

if volume of gas is kept constant. its pressure increase with increase in temperature. four example when the air is suck out of bottle. the air present outside it exert pressure in all possible direction of bottle. show the bottle get crushed

aeroplanes are pressurised because human need a certain amount of oxygen to live. the higher you go the thinner the air. and the less oxygen to breathe. it leads to lower level of oxygen in your blood. therefore aeroplane are pressurized

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