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What is air pressure?

  1. The pressure exerted by the air in water
  2. The pressure exerted by the humans
  3. The pressure exerted by the clouds
  4. The pressure exerted by the weight of the air.

Answer: The pressure exerted by the weight of the air.

Long Answer:

The pressure exerted by air is called air pressure. Air pressure can be measured an instrument called barometer.

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