(atm) unit of measurement equal to air pressure at sea level, about 14.7 pounds per square inch. Also called standard atmospheric pressure. force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth.
Furthermore, what is the unit of measure for air pressure?
As mentioned, a mercurial barometer makes measurements in inches of Mercury (in Hg). This unit is commonly used in aviation in the U.S. Pounds per square inch (abbreviated as p.s.i.) is common in the English system of units, and the pascal (abbreviated Pa) is the standard in the Metric (SI) system.
What instrument is used to measure air pressure How does it measure pressure?
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury.
What is the pressure of air?
One atmosphere (101.325 kPa or 14.7 psi) is also the pressure caused by the weight of a column of fresh water of approximately 10.3 m (33.8 ft). Thus, a diver 10.3 m underwater experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water).