Is the sunny high temperature low or high?

High temperature on a sunny day is high pressure.

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.

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Discovery and application

1640 10 Torricelli, assistant of Torricelli Galileo, realized that the weight of air in the atmosphere exerted pressure on the mercury in the basin, and this force pressed the mercury into the glass tube. The weight of mercury in the glass tube should be exactly equal to the weight of mercury exerted by the atmosphere on the basin.

When the weight of the atmosphere changes, the pressure it exerts on the basin will increase or decrease, thus causing the mercury column in the glass tube to rise or fall. Weather changes will inevitably cause changes in the weight of the atmosphere. Torricelli discovered atmospheric pressure and found a way to measure and study it.

Torricelli's discovery was the beginning of a formal study of weather and atmosphere, which made us understand the atmosphere and laid the foundation for Newton and other scientists to study gravity. At the same time, this new discovery made Torricelli create the concept of vacuum and invented the basic instrument of meteorological research-barometer.

Baidu encyclopedia-air pressure