What is the standard atmospheric pressure? What is the normal temperature and pressure?

Normal temperature is 25 degrees, one standard atmospheric pressure is 101kPa (760mm mercury), room temperature is 25-27℃, normal temperature and pressure are the collection of normal temperature and one standard atmospheric pressure. (Two conditions)

In chemistry, standard temperature and pressure (STP) was once defined as 0°C (273.15K) and 101.325kPa (1atm), but since 1982, IUPAC has defined "standard pressure" as Redefined as 100 kPa.

1 Standard atmospheric pressure = 760mm mercury = 76cm mercury = 1.01325×10^5Pa = 10.339m water column. 1 standard atmospheric pressure = 101325 N/㎡. (In calculations, it is usually 1 standard atmosphere = 1.01×10^5 N/㎡). 100kPa=0.1MPa

Extended information:

The changes in atmospheric pressure are related to altitude. Atmospheric pressure is generated by the gravity of the atmosphere. The higher you are from the ground, the thinner the atmosphere, and the lower the atmospheric pressure there should be. However, because air density, related to the gravitational force on the atmosphere, varies unevenly with height, the atmospheric pressure decreases unevenly with height. Changes with altitude: Atmospheric pressure decreases with altitude.

Changes in atmospheric pressure are also related to weather. The atmospheric pressure in the same place is not exactly the same at different times. We know that the density of water vapor is smaller than that of air. When the air contains more water vapor, the density of the air becomes smaller and the atmospheric pressure also decreases.

When the air cools, the air shrinks, the density increases, the weight of the air column per unit area increases, and the air pressure also increases. Therefore, when cold air arrives, it is always accompanied by an increase in air pressure, and when warm air arrives, the air pressure decreases. Winter is a world of cold air, and summer is a world of warm air. The reason why air pressure is high in winter and low in summer is very clear.

Baidu Encyclopedia - Standard Atmospheric Pressure