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Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, [1] 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. [2]
Air pressure is the weight of the air above us. Learn how air pressure varies with temperature and density, and how it affects weather systems and winds.
30 sie 2024 · 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.
4 lut 2020 · The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface, and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure.
20 maj 2023 · Air pressure is caused by the weight of the air molecules above. Even tiny air molecules have some weight, and the huge numbers of air molecules that make up the layers of our atmosphere collectively have a great deal of weight, which presses down on whatever is below.
29 sie 2013 · Learn how atmospheric pressure is caused by the weight of the air above us and how it affects weather patterns. Find out how to measure pressure with a barometer and what factors influence it.
18 gru 2023 · Learn how air pressure is affected by the number and speed of molecules, temperature, and elevation. Find out how to measure and interpret air pressure changes and their relation to weather.
