In what season (indoor delta) is the air humid?

It is dry in winter and humid in summer.

Because the weather is hot in summer, the water vapor evaporates and the relative humidity is relatively high. At night, when the temperature drops, the moisture becomes steam again. There is too much moisture in the air, and the air has poor fluidity and feels wet.

In summer, air conditioners are widely used to reduce the indoor temperature, the doors and windows of rooms are closed, and the indoor air exchange rate is low. Under the conditions of high temperature and high humidity in summer, the release of some harmful gases increases. The research shows that when the indoor temperature is 30 degrees Celsius, the amount of toxic and harmful gases released indoors is the highest.

summary

The higher the temperature of air, the higher its ability to contain water vapor (different from water vapor). Although water vapor can react with some components in the air or be absorbed by porous particles, the proportion of these processes or reactions is very small. On the contrary, most water vapor can be dissolved in air. Dry air can generally be regarded as an ideal gas, but with the increase of water vapor composition, its ideality is getting lower and lower. At this time, only van der Waals equation can describe its performance.