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18 paź 2021 · Scientists regularly measure the gases that make up our atmosphere. They need this data not only to model and predict climate change, but also to track substances that contribute to pollution and other air quality issues.
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]
19 paź 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 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.
Atmospheric pressure is measured by a barometer that employs a silicon capacitive pressure sensor having excellent repeatability and long term stability characteristics.
Of course, accurate measurements of atmospheric pressure are of fundamental importance in weather prediction. Modern-day barometers that feed these predictions use sophisticated sensors that generate repeatable measurements and are stable over long time periods.
This chapter gives a brief overview of the different ways of classifying atmospheric measurements, the relevant states and processes that influence measurements in the atmosphere, and basic measurement techniques (including some fundamental aspects of the performance and interpretation of these techniques).
