How much kpa is the atmospheric pressure in Changsha?

The atmospheric pressure is the result of the gravity of the earth. Due to the gravity of the earth, the atmosphere is "sucked" to the earth, thus generating pressure, and the atmospheric pressure is the highest near the ground. 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.

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 air pressure is 76 mm, which means that the atmospheric pressure at that time is equal to the pressure generated by a mercury column with a height of 76 mm. The other is the millibar (mb) that is often heard in weather forecast broadcasts. It is a unit to express the air pressure by the pressure of the atmospheric column per unit area.

1 mbar =1 dynes/cm2 (1 bar =1 mbar). Therefore, 1 millibar represents a force of l dynes on an area of L square centimeters. When the air pressure is 76 mm Hg, it is equivalent to 113.25 mbar, which is called a standard atmospheric pressure.