how air exerts pressure...
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All gases exerts pressure. Air is a mixture of gases. So, air exerts pressure on everything on the earth.
For example :The drinking of a liquid with the help of a hollow Straw is based on the pressure exerted by the air on the surface of liquid. When sacked through a hollow straw, the liquid rises into the straw due to difference in the pressure of the air inside and outside the straw.
For example :The drinking of a liquid with the help of a hollow Straw is based on the pressure exerted by the air on the surface of liquid. When sacked through a hollow straw, the liquid rises into the straw due to difference in the pressure of the air inside and outside the straw.
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