What is the atmospheric pressure?

The atmospheric pressure is 10 13.2 mbar.

Atmospheric pressure refers to bearing the weight of atmospheric column per unit area. Meteorology is often expressed in millibars or millimeters of mercury. The standard atmospheric pressure is 10 13.2 mbar, or equivalent to 760 mm high mercury. Because the higher the ground is, the lower the air pressure is, so the height can be calculated according to the vertical change of air pressure.

In the horizontal direction, the difference of air pressure will cause airflow, so it is one of the important meteorological elements for analyzing weather forecast. From the point of view of air molecular movement, atmospheric pressure is the result of the comprehensive action of air molecular movement and the earth's gravity field. Under this comprehensive action, the impact force exerted by many air molecules per unit area on the plane at every moment is expressed as air pressure.

Air pressure measurement method

There are two kinds of measuring instruments commonly used in meteorology: liquid (such as mercury) barometer and solid (such as metal empty box) barometer. The barometric record is measured by a barometer or barometer installed in a barometric chamber with small temperature change and sufficient light. There are regular air pressure records and continuous air pressure records.

Manual visual timing barometric records are measured by moving tank or fixed tank mercury barometer, which is observed 4 times a day at the basic station and 24 times a day at the reference station. The metal elastic diaphragm is used as the sensor to record the continuous and timed air pressure records of remote automatic observation, and the air pressure records at any time can be obtained.

These instruments are used to measure the pressure of this station, and the sea level pressure can be calculated according to the elevation of this station, the pressure of this station, the temperature of the gas column and other parameters.

Refer to Baidu Encyclopedia-Atmospheric Pressure for the above contents.