What is atmospheric pressure?

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(A) Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere above a given point.At sea level,the standard atmospheric

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The pressure exerted by the weight of the atmosphere.

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(A) Atmospheric pressure is the force per unit area exerted by the weight of the atmosphere above a given point.At sea level,the standard atmospheric pressure is approximately $1.013 	imes 10^5 \ Pa$ or $1 \ atm$.It is caused by the gravitational attraction of the Earth on the air molecules in the atmosphere.As altitude increases,the density of air decreases,leading to a decrease in atmospheric pressure.

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