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Atmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface and is a function of the mass of the planet, the radius of the surface, and the amount and composition of the gases and their vertical distribution in the atmosphere.
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
Feb 27, 2024 · Barometric pressure is a measurement of the air pressure in Earth's atmosphere. For this reason, it is also known as atmospheric pressure. The pressure is created by fluid gas molecules in the air, and it extends in all directions.
Jun 15, 2020 · Atmospheric pressure is also known as barometric pressure because it is measured using a barometer. A rising barometer indicates increasing atmospheric pressure and a falling barometer indicates decreasing 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...
- The standard unit for measuring barometric pressure is called an atmosphere (atm). In relation to the English system of measurement, one atmosphere...
- 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...
- 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.
Atmospheric pressure is measured by a barometer with a silicon capacitive pressure sensor, known for its excellent repeatability and long-term stability.
The atmospheric pressure can be measured with a mercury barometer. It is a glass tube closed at the top and placed in an open container filled with mercury. At equilibrium, the height of the mercury column inside the tube equals the atmospheric pressure. At sea level, this height is h = 760 mm.
