Traditional Culture Encyclopedia - Weather inquiry - What is the air pressure in Xi 'an?
What is the air pressure in Xi 'an?
Atmospheric pressure is the result of the earth's gravity. Due to the gravity of the earth, the atmosphere is "sucked" to the earth, producing pressure, and the atmospheric pressure near the ground is the highest.
Atmospheric pressure in meteorological science refers to the weight of atmospheric column per unit area (atmospheric pressure), that is, the pressure exerted by atmospheric column per unit area.
Extended data:
There are two units of air pressure: millimeter (mm) and millibar: the unit of air pressure expressed by the height of mercury column. For example, the atmospheric pressure is 760 mm, which means that the atmospheric pressure at that time is equal to the pressure generated by a 760 mm high mercury column.
The other is the millibar (mb) that is often heard in weather forecast broadcasts. It is a unit of air pressure expressed by the pressure of atmospheric pressure column per unit area. 1 millibar = 1000 dynes/cm2 (1 bar = 1000 millibar).
1 millibar means that 1000 dynes are on the area of 1 cm2. When the air pressure is 760mmhg, it is equivalent to 10 13.25mbar, which is called a standard atmospheric pressure.
Baidu encyclopedia-atmospheric pressure
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