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  2. Feb 27, 2024 · Scientists typically measure barometric pressure and barometric pressure fluctuations using a standard unit called an atmosphere (atm). In the English system of measurement, which is popular in the United States, one atmosphere equals 29.9213 inches (1,013 millibars) of mercury (in. Hg).

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      ­A barometer measures air pressure: A "rising" barometer...

  3. 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 ]

  4. Dec 5, 2023 · The unit of measurement for barometric pressure is the millibar (mb) or the hectopascal (hPa), with 1 mb equal to 1 hPa. These units are commonly used in weather reports and forecasts. How is Barometric Pressure Measured? Barometric pressure is measured using an instrument called a barometer. There are different types of barometers, but the two ...

  5. The SI unit for pressure is Pascals (Pa). The standard atmosphere (atm) is approximately equal to the barometric pressure at mean sea level, 101325 Pa. We can use it as a reference value or a unit of atmospheric pressure.

  6. Atmospheric pressure can be measured with a mercury barometer (hence the commonly used synonym barometric pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer.

    • The Editors of Encyclopaedia Britannica
  7. A barometer is a device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid.

  8. May 29, 2024 · Atmospheric pressure, also known as barometric pressure, is the force per unit area exerted by the atmosphere at a given point on Earth.

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