High temperature leads to high air pressure, or high temperature leads to low air pressure.

High temperature and low air pressure.

When the air is cooled, the air contracts, the density increases, the weight of air column per unit area increases, and the air pressure also increases. So the arrival of cold air is always accompanied by the increase of air pressure, and when warm air comes, the air pressure will decrease again. Winter is a world of cold air and summer is a world of warm air, so obviously, the air pressure is high in winter and low in summer.

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.

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.

Often the atmospheric pressure decreases and the weather turns cloudy; When the atmospheric pressure rises, the weather will get better. There are many reasons for the change of air pressure, among which the change of temperature is a very important one.

Extended data

Atmospheric pressure is related to altitude, atmospheric temperature and atmospheric density, and generally decreases exponentially with altitude. The air pressure changes every day and every year.

In a year, the air pressure in winter is higher than that in summer. In a day, the air pressure has a maximum value and a minimum value, which appear at 9 ~ 10 and 15 ~ 16 respectively, and the second high value and the second low value appear at 2 1 ~ 22 and 3 ~ 4 respectively. The daily variation of air pressure is small, generally 0. 1 ~ 0.4 kPa, and decreases with the increase of latitude.

The change of air pressure is closely related to wind and weather, so it is an important meteorological factor. The commonly used units of air pressure are Pa, mmHg and millibar. The conversion relationship between them is:100pa =1mbar ≈ 3/4 mm mercury column height.

Commonly used instruments for measuring atmospheric pressure in meteorological observation include mercury barometer, empty box barometer and barometer. When the temperature is 0℃ and the pressure is 760mm, the standard atmospheric pressure is first measured by Italian scientist Torricelli.

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