Why does the pressure increase in rainy weather and the solubility of oxygen in water decrease?

Before the rain, the humidity in the air was high and the water vapor content was high, which reduced the atmospheric pressure.

Junior high school physics tells us: "The change of atmospheric pressure is closely related to the weather. Generally speaking, the air pressure in sunny days is higher than that in cloudy days, and the air pressure in winter is higher than that in summer. " It is often difficult for teachers to explain this narrative clearly. In my opinion, this problem can be attributed to the relationship between temperature, humidity and atmospheric pressure. Let me talk about my preliminary understanding.

When we heat a closed container filled with air, its pressure will definitely increase. For the atmosphere, things are different. When the atmospheric temperature in a certain area rises due to some factors, it will inevitably lead to the expansion of air volume, and air molecules will inevitably spread around. When the temperature is high, gas molecules will definitely move faster, which becomes a factor to promote the increase of pressure. On the other hand, as the temperature rises, gas molecules will diffuse around. Then the number of gas molecules in this area will decrease, thus forming a factor to reduce the pressure. The actual situation is the result of the interaction of the above two opposing factors. As for which of these two factors plays the main role, we might as well look at the actual situation that the pressure of the mainland and the ocean changes with temperature. We say that the temperature in the mainland is higher than that in the ocean in summer, and the pressure in the mainland is lower than that in the ocean because the air in the mainland diffuses to the ocean. In winter, the temperature of the mainland is lower than that of the ocean, and the pressure of the mainland is higher than that of the ocean. Therefore, in the two factors of temperature change and molecular diffusion, diffusion plays a major and decisive role. It should be pointed out that the diffusion mentioned here refers to the lateral flow of air, because the vertical flow of air cannot change the weight of the vertical air column (some literature ② describes the pressure change caused by temperature as the result of air fluctuation, which

In rainy days, the atmospheric pressure is much lower than that in sunny days, which reduces the amount of dissolved oxygen in water.

These two paragraphs are encyclopedic explanations. I hope you can understand them.

References:

/view/33387.htm