prove that air exerts pressure in all directions.
Answers
The earth we live is surrounded by a blanket of air. Air is a mixture of gases. Air surrounding the earth is called as atmosphere. This gases have some weight, so they experience some gravitational force. These mixture of gases exert pressure on us and is called air pressure or atmospheric pressure. Atmospheric pressure is a technical term used to represent the pressure exerted by the air at a place.“A barometer is an instrument used for measuring atmospheric pressure.”
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Aim:
Aim: To prove that air exerts pressure.
Materials required:
glass tumbler, water, cardboard
Procedure:
1. Fill the glass tumbler with water up to its brim, such that there are no air bubbles inside it.
2. Keep a rectangular piece of cardboard on the mouth of the tumbler.
3. Giving the cardboard support with one hand, invert the tumbler.
4. Slowly remove your hand.
5. Note your observations.
6. Now, fill one-fourth of the tumbler with water and the remaining three-fourths with air.
7. Again, place the cardboard on the mouth of the tumbler. Invert the tumbler.
8. Note your observations.
Observations:
In the first case, you observe that the cardboard is stuck to the tumbler even when you remove your hand. This happened because the air pressure was acting upwards on the paper and the cardboard did not fall as shown in the picture. However, in the second case, the pressure of air inside the tumbler acted downwards and pushed the cardboard out and the water started running.