Why is the atmospheric pressure in winter higher than that in summer?

The first volume of junior high school physics textbook talks about the atmospheric pressure is higher in winter than in summer in the section "Changes of Atmospheric Pressure". Here, only the conclusion is given, and no explanation is given. Many junior high school physics teachers are vague about this issue. Many magazine articles have answered this question. The basic idea of most articles is that the volume of gas shrinks when the temperature is low in winter, and the volume of gas expands when the temperature is high in summer, which causes the air density in winter to be higher than that in summer, so the atmospheric pressure in winter is higher than that in summer. After reading the above explanation, teachers still feel incomprehensible, because they lack theoretical basis, which makes people feel unconvinced. In order to solve this problem and explain the rationality of the above viewpoints, the following is a further demonstration based on the theory of molecular motion. In classical physics, the distribution of air molecules in gravity field is analyzed and discussed, and the distribution law of air in space satisfies Boltzmann distribution law. Its formula is several twenty-nine. If the height of RT Byg (3) is h, then the number of gas molecules in this volume is [gan _ "_, plus a few t _', where-N=! Outside. . An arrow' mountain two sons two stand (1. (4) JOBAG (4) formula indicates the number of gas molecules in a finite high air column. Ding Fan = nine oP (1) ┌ ┐ ┌ S 2 1 └ ┘ ┘ In order to compare that the volume of the atmosphere in winter is smaller than that in summer, it is impossible to take the whole atmosphere as the research object, because the height of the atmosphere should be infinitely high in winter and summer, but we can choose this part with a relatively high air density near the ground.