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As elevation increases, fewer air molecules are above. Therefore, atmospheric pressure decreases with increasing height. The following relationship is a first-order approximation:
where P is the pressure in pascals and h the height in metres. This shows that the pressure at an altitude of 31 km is about 1% of that at sea level. [Source: US Department of Defense Military Standard 810E]
A column of air, 1 square inch in cross section, measured from sea level to the top of the atmosphere would weigh approximately 14.7 lb. A 1 m2 column of air would weigh about 10 tonnes. See density of air.
Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101.325 kPa. (see also Standard temperature and pressure)
This can also be stated as:
This "standard pressure" is a purely arbitrary representative value for pressure at sea level, and real atmospheric pressures vary from place to place and moment to moment everywhere in the world.
In a low atmospheric pressure system the atmospheric pressure of the air mass is lower than that of the surrounding air. Low atmospheric pressure systems are symbolized by an L on a weather mapA weather map provides a view of weather elements over a specified geographical area at a specified time. It is obtained by plotting or tracing the values of relevant quantities such as pressure, temperature, cloud cover, and others, onto a geographical m and are associated with areas of storminess and precipitation. WindFor the 1928 film, see The Wind. Wind in the most general sense, is the movement of air. It occurs at all scales, from local breezes generated by heating of land surfaces and lasting tens of minutes to global winds resulting from solar heating of the plan movement is cyclonicThis article is about the meteorological phenomenon. For other uses of the term see Cyclone (disambiguation). In meteorology, a cyclone refers to the rotation of a volume of air about an area of low atmospheric pressure. Cyclones are responsible for a wid around a low pressure system and cold fronts and warm frontsIn meteorology, a weather front is a boundary between two air masses with differing characteristics (e. air temperature or humidity). When a weather front passes over an area, it is marked by changes in temperature, wind speed and direction, atmospheric p are generally connected to them.
In a high atmospheric pressure system the atmospheric pressure of the air mass is higher than that of the surrounding air. High atmospheric pressure systems are symbolized by an H on a weather mapA weather map provides a view of weather elements over a specified geographical area at a specified time. It is obtained by plotting or tracing the values of relevant quantities such as pressure, temperature, cloud cover, and others, onto a geographical m and are associated with areas of clear weatherWeather comprises all the various phenomena that occur in the atmosphere of a planet. On Earth the regular events include wind, storms, rain, and snow, which occur in the troposphere or the lower part of the atmosphere. Weather is driven by energy from th.
It is possible to demonstrate atmospheric pressure in a classroom or home environment using the crushing can experiment. See Atmospheric pressure demo
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