Is the local atmospheric pressure greater than, equal to or less than 1 standard atmospheric pressure?

It is possible that the local atmospheric pressure is greater than, equal to or less than 1 standard atmospheric pressure. Different areas have different altitudes and different air pressures. Standard atmospheric pressure is the air pressure at sea level under standard atmospheric conditions.

The standard atmospheric pressure was put forward by physicist Torricelli in 1644, and its value is 10 1.325kPa, which is the unit of pressure and is recorded as atm.

In chemistry, the standard temperature and pressure (STP) was once defined as 0 C (273.15k) and101.325kpa (1ATM), but starting from 1982, IUPAC will

1 standard atmospheric pressure = 760mmhg = 76cmhg =1.01325x105pa =10.339m water column.

Extended data:

The change of atmospheric pressure is related to altitude. Atmospheric pressure is produced by gravity in the atmosphere. The higher the ground, the thinner the atmosphere, and the smaller the atmospheric pressure should be. However, because the air density related to the gravity received by the atmosphere varies unevenly with height, the atmospheric pressure decreases unevenly with height. Change with height: atmospheric pressure decreases with the increase of height.

The change of atmospheric pressure is also related to the weather. At different times, the atmospheric pressure in the same place is not exactly the same. We know that the density of water vapor is less than that of air. When there is more water vapor in the air, the air density will become smaller and the atmospheric pressure will also decrease.

With climate change: Generally speaking, the air pressure is higher on sunny days than on cloudy days, higher in winter than in summer, and higher in morning than at noon.

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