What is the standard atmospheric pressure in Pa?

The standard atmospheric pressure is 10 1325 Pascal (Pa).

1. What is the standard atmospheric pressure in Pa?

Standard atmospheric pressure means that at sea level, the temperature is 15 degrees Celsius, the relative humidity is 0%, and the acceleration of gravity is 9.80665 m/s? The standard atmospheric pressure is 10 1325 Pascal (Pa). It is an international atmospheric pressure unit.

2. Measurement of atmospheric pressure

Atmospheric pressure can be measured by barometer. Common barometers are mercury barometer and air barometer. Mercury barometer uses the height of mercury column to measure air pressure, and air barometer uses the principle of elastic deformation to measure air pressure.

3. Changes in atmospheric pressure

Atmospheric pressure will gradually decrease with the elevation. This is because at sea level, the atmosphere is thick and the gas molecules have strong attraction, so the atmospheric pressure is high. With the increase of height, the thickness of the atmosphere decreases, and the attraction of gas molecules weakens, resulting in the gradual decrease of atmospheric pressure.

4. Application of atmospheric pressure

Atmospheric pressure has important applications in many fields. For example, in meteorology, atmospheric pressure is one of the important indicators to predict weather changes. In the engineering field, it is also necessary to consider the change of atmospheric pressure. For example, when designing a building at high altitude, it is necessary to consider the influence of atmospheric pressure reduction on the building structure.

The standard atmospheric pressure is determined according to the international standard atmospheric model, which is an idealized situation. In fact, atmospheric pressure will change due to geographical location, season, weather and other factors.

Besides Pascal (Pa), the common units of atmospheric pressure are millibar (mbar) and standard atmospheric pressure (atm). Standard atmospheric pressure 1 is equal to1013.25mbar, and is also equal to101325mpa.

Changes in atmospheric pressure also have a certain impact on the human body. For example, at high altitude, the reduction of atmospheric pressure will lead to the reduction of oxygen partial pressure, which will affect the human body's breathing and adaptability.