Why is the air pressure higher in winter than in summer?

The first volume of junior high school physics textbook talks about that the atmospheric pressure in winter is higher than that in summer in the section of "Changes of atmospheric pressure". Only conclusions are given here, and no explanations are given. Many junior high school physics teachers are vague about this question. Many magazine articles have answered this question. The basic idea of most articles is that the air volume shrinks when the temperature is low in winter and expands when the temperature is high in summer, resulting in higher air density in winter than in summer, so the atmospheric pressure in winter is higher than in summer. After reading the above explanation, the teachers still feel that they can't understand it, because they lack theoretical basis, which makes people feel unconvinced. In order to solve this problem and explain the rationality of the above viewpoint, the following is a further demonstration based on the theory of molecular motion. The distribution of air molecules in gravity field is analyzed and discussed in classical physics, and the distribution law of air in space satisfies Boltzmann distribution law. Its formula is several twenties. If the height of RT Byg (3) is h, then the number of gas molecules in this volume is [gan _ "_, plus several t _', where -N=! Outside. . One arrow' mountain 2, two sons and two stands (1, one. (4) The job ag (4) formula indicates the number of gas molecules in a finite air column. Ding Fan = nine op (1) ┌┐┐ s II1└┘┘┘ In order to compare the volume of the atmosphere in winter with 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