Is the air pressure low or high when the temperature is high?

The higher the temperature, the lower the air pressure.

Pressure formula: P=F/S, which shows that the pressure is only related to F. With the increase of temperature, the atmosphere becomes thinner and the density becomes smaller. So in this designated area where the atmosphere is thin, the pressure becomes smaller, so the air pressure becomes lower.

The concept of air pressure is the atmospheric pressure acting on the unit area, that is, it is numerically equal to the gravity of the vertical air column extending upward to the upper limit of the atmosphere. The famous experiment in the Madeborg hemisphere proved its existence. atmospheric pressure

The international system unit is Pascal, abbreviated as Pa, and the symbol is PA. In meteorology, people usually use kilopascals (kPa) or hectopascals (hpa) as units. Other commonly used units are bar (bar, 1 bar = 100000 Pa) and centimeter mercury (or centimeter mercury). Air pressure varies not only with height, but also with temperature. The change of air pressure is closely related to the change of weather.

Principle of relationship between temperature and air pressure;

The higher the temperature in the closed container, the higher the air pressure; In the atmosphere, the higher the temperature, the lower the air pressure. When the temperature is high, the gas expands (the principle of thermal expansion and cold contraction), so the gas density is small and the pressure is small. When the temperature is low, the gas contracts and the gas density becomes higher, so the air pressure becomes higher.