explain two applications of atmospheric pressure
Answers
Atmospheric pressure helps in the filling of the a hypodermic syringe when the piston of the syringe is pulled back.
Atmospheric pressure pushes the water inside the hand pump when you push the handle of the pump up and down.
Applications of atmospheric pressure
1. Drinking straw : You normally use a drinking straw to drink fruit juice. When you suck air at the upper end of the straw with your mouth, the pressure of the air inside the straw is reduced. But the pressure acting on the surface of the fruit juice is equal to the atmospheric pressure. So, the greater atmospheric pressure acting on the surface of the fruit juice pushes the fruit juice up into the straw to your mouth.
2. Syringe : When we dip a syringe in a liquid and pull its piston, the pressure inside the syringe gets reduced. The atmospheric pressure acting on the surface of the liquid is more in comparison to the air pressure in the syringe and thus it pushes the liquid up into the syringe.
3. Rubber suction pad : Rubber suction pads are used on the walls to hang clothes and calenders. When good quality rubber suction pad is pressed against the smooth plane surface (wall), the air between the suction pad and the wall is forced out, reducing the pressure inside. The outer atmospheric pressure being greater, pushes the suction pad firmly and it adheres to the surface of the wall.
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The effect of the applied force depends on following two factors:
The magnitude of force applied
- The greater the force, the greater is its effect.
The area over which the force is applied
- The smaller the area of contact, the greater is its effect.