Question

Which of the following does not make use of air pressure?
a) Straw
b) pencil
c) dropper
d) syringe
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Answer 1

b) pencil

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Answer 2

Pencil does not work based on air pressure.(option b)

• In Aerosol, Pressing the nozzle of the can changes the air pressure inside which causes the liquefied gas to boil and become a vapor.

• In spring balance, It consists of a coiled spring which gets stretched when a force is applied to it. 

• The syringe works on the existence of atmospheric pressure.The greater atmospheric pressure acting on the surface of the liquid pushes the liquid up into the syringe.

• In barometer, The air pressure is high, the mercury will rise and at low air pressure, the mercury goes down.