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The average pressure at mean sea level in the International Standard Atmosphere is 1,013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury. Pressure (P), mass (m), and acceleration due to gravity (g) are related by P = F/A = (m*g)/A, where A is the surface area.
Atmospheric pressure is the force per unit area exerted by a body of air above a specified area (called an atmospheric column). It is expressed in several different systems of units, including millimeters (or inches) of mercury, pounds per square inch (psi), millibars (mb), or standard atmospheres.
- The Editors of Encyclopaedia Britannica
Jun 15, 2020 · The standard unit for measuring barometric pressure is called an atmosphere (atm). In relation to the English system of measurement, one atmosphere (atm) equals 29.9213 inches of mercury (inHg). In both millibars (mb) and hectopascal (hPa), the standard pressure at sea level is 1013.25 mb or hPa.
- What is Atmospheric Pressure?Essentially, atmospheric pressure is the force exerted at any given point on the Earth’s surface by the weight of the air above that point. In shor...
- What Causes Changes in Atmospheric Pressure?Changes in air pressure are caused by differences in air temperature above the earth, and the temperature of an air mass is determined by its locat...
- Why Does Atmospheric Pressure Change With Altitude?Simply put, when altitude increases, the amount of gas molecules in the atmosphere decreases (air becomes less dense), hence the term “thin air” wh...
Oct 19, 2023 · An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). One atmosphere is 1,013 millibars, or 760 millimeters (29.92 inches) of mercury. Atmospheric pressure drops as altitude increases.
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101 325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's average atmospheric pressure at sea level.
Aug 29, 2013 · Atmospheric pressure is the force exerted against a surface by the weight of the air above the surface.
The conversion between pascals and atmospheres is, not surprisingly, 1 atm = 1.01 × 10 5 Pa since one atmosphere is defined to be the pressure of the Earth's atmosphere. What do solved examples involving pressure look like?
