how would you demonstrate that air exerts pressure ?
Answers
The envelope of air surrounding the earth is called atmosphere. Air has weight. The weight of air presses our bodies all the time. This weight of air acting on a surface causes air pressure. Air pressure can be understood with the help of certain activities.
Activity
Materials Required: Bottle, crumpled piece of paper
Method: Crumple a small piece of paper into a ball of a size smaller than the mouth of an empty bottle. Hold the empty bottle on its side and place the paper ball just inside its mouth. Now try to blow on the ball to force it into the bottle.
Observation: The paper does not move inside.
Inference: The air pressure at the mouth of the bottle is reduced due to more speed. This forces the air out from the bottle. This prevents the crumpled paper ball to move inside.
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Answer:
We have experienced that when we blow a balloon, the balloon becomes tight. If we try to fill more air, then the balloon will burst after an extent. This happens because air exerts pressure
We have also experienced the movement of fringes of windows and doors of our houses when wind blows in a high speed. This also happens because air exerts pressure