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Atmospheric Pressure

 
2.2  Atmospheric Pressure
 
  Atmospheric pressure  
 

Pressure due to the weight of the layer of air acting on the surface of the Earth.

  
     
 

Instruments to measure atmospheric pressure
  • Fortin barometer
  • Mercury barometer
  • Aneroid barometer
 

Applications of atmospheric pressure
  1. Drinking straw
    • When straw is sucked, the air velocity in straw is high
    • The air pressure in the straw is lower than atmospheric pressure
    • Air is pushed up into a straw by atmospheric pressure
  2. Rubber sucker
    • When the rubber is pressed, the air is removed
    • There is low pressure inside rubber sucker (partial vacuum)
    • Atmospheric pressure is higher than pressure inside rubber
    • Rubber sucker sticks on surface
  3. Siphon
    • Atmospheric pressure is higher than the pressure in the siphone
    • The atmospheric pressure acting on liquid push the liquid down to a lower container
  4. Syringes
    • When the piston is pulled, the pressure in the syringe decreases
    • The pressure in the syringe is lower than atmospheric pressure
    • The atmospheric pressure at the surface force water into the syringe.
  5. Vacuum cleaner
    • Vacuum fan removes air from space inside dust bag
    • The pressure in the dust bag is lower than atmospheric pressure
    • Outside air is sucked into the dust bag together with dusts
 
 

 

The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of Pandai.

Atmospheric Pressure

 
2.2  Atmospheric Pressure
 
  Atmospheric pressure  
 

Pressure due to the weight of the layer of air acting on the surface of the Earth.

  
     
 

Instruments to measure atmospheric pressure
  • Fortin barometer
  • Mercury barometer
  • Aneroid barometer
 

Applications of atmospheric pressure
  1. Drinking straw
    • When straw is sucked, the air velocity in straw is high
    • The air pressure in the straw is lower than atmospheric pressure
    • Air is pushed up into a straw by atmospheric pressure
  2. Rubber sucker
    • When the rubber is pressed, the air is removed
    • There is low pressure inside rubber sucker (partial vacuum)
    • Atmospheric pressure is higher than pressure inside rubber
    • Rubber sucker sticks on surface
  3. Siphon
    • Atmospheric pressure is higher than the pressure in the siphone
    • The atmospheric pressure acting on liquid push the liquid down to a lower container
  4. Syringes
    • When the piston is pulled, the pressure in the syringe decreases
    • The pressure in the syringe is lower than atmospheric pressure
    • The atmospheric pressure at the surface force water into the syringe.
  5. Vacuum cleaner
    • Vacuum fan removes air from space inside dust bag
    • The pressure in the dust bag is lower than atmospheric pressure
    • Outside air is sucked into the dust bag together with dusts
 
 

 

The views expressed in the notes here are those of the contributor and don’t necessarily represent the views of Pandai.
Chapter : Pressure
Topic : Atmospheric Pressure
Form 5 Physics
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