Answer:
(atm) unit of measurement equal to air pressure at sea level, about 14.7 pounds per square inch. Also called standard atmospheric pressure. atmospheric pressure. Noun. force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth.
The atmosphere exerts pressure of about 10 power 5 and Nm power-2 or 760 mm of HG at sea level is known as standard atmospheric pressure
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