how can we show that air exert pressure
Answers
Answer:
here are..
"Five examples of pressure in daily life:
The air filled in car tires lifts the whole car weight.
"Sucking a drink" through a straw -" fluid flows because" of the pressure difference.
The flying of aircraft due to the "pressure on the wings".
"Small bullet fired" from a gun" with pressure.
Explanation:
Activity I
Materials Required: tumbler, water, square cardboard piece
Method: Fill up the tumbler with water up to the brim. Cover it with cardboard piece and turn the glass upside down. Slowly remove your hand.
Observation: Cardboard does not fall and water stays in the glass.
Inference: air pushes the cardboard up and prevents it from falling.
Activity II
Materials Required: plastic bottle with cap, hot water, cold water
Method: Pour hot water into the plastic bottle. Empty the bottle and put the cap tightly. Pour some ice-cold water on it.
Observation: The bottle will get de-shaped.
Inference: The air from the bottle expands as it becomes hot. When it is cooled, air contracts. The outside air has more pressure and it crushes the bottle.
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