Why is the air pressure low in rainy weather?

Air pressure usually refers to the level of oxygen concentration. Winter is dry and cold, the air density is higher than that in summer, and the water vapor content is lower than that in summer, thus making the oxygen concentration higher than that in summer. The water vapor content in the air on sunny days is much less than that on cloudy days, and the relative oxygen concentration is higher, so the air pressure on cloudy days is lower. The place where the amount of clouds in the middle and low clouds accounts for more than 8/ 10 of the sky area is called cloudy. Cloudy days are dark days, and little or no sunlight can penetrate the clouds.

Why do you sleep soundly on rainy days?

On rainy days, the content of water molecules in the air increases and the air density decreases, so the rainy weather is depressed. Compared with sunny days, the oxygen content in rainy days is lower, and the sympathetic nerve is easy to be in a depressed state, which makes it easier for people to stay at home, especially in bed. In addition to air pressure and light, another important factor that cannot be ignored in rainy days is the sound of rain. Why do you sleep better when listening to the rain? Zhao Sijia, Ph.D. in Neuroscience, University College London, and the author of "A Guide to Brain Use" explained: During sleep, hearing will continue to work, and the sound of rain is similar to white noise, which will have a masking effect, shielding many sudden sounds that may be felt during sleep, thus improving the quality of sleep.