In a hot environment, the higher the humidity, the hotter it feels, but in a cold environment, high humidity will make clothes wet, reduce the thermal resistance of clothes and increase people's cold feeling. The weather is getting colder, wetter and colder. This is a cycle. People will feel colder after more humid air.

Humidity has a lot to do with temperature. The higher the temperature, the stronger the ability to wet the air. This is because the higher the temperature, the faster the water vapor molecules move, and more water vapor can be contained in the air. In the low temperature environment, the saturated water vapor content is actually very small. Dew in summer morning, frost in winter morning, humidity 100%.

In this hot summer weather, the sweat secreted by the human body is difficult to evaporate, and it feels sultry. On the contrary, in autumn, because the humidity is obviously reduced, people are sweating all over but rarely feel "sultry". If we encounter low temperature and high humidity in winter, people will feel wet and cold.

Extended data

Air humidity plays an important role in many aspects, mainly in theory in meteorology, climatology and meteorology, but it has little effect in practical application.

1, Meteorology and Hydrology

When it rains, the air is very humid. In meteorology and hydrology, humidity is an important data to determine evaporation and transpiration, and plays a decisive role in the production of different climatic zones. Water forms precipitation, clouds and other phenomena in the atmosphere, which determine the weather and climate of the earth.

Relative humidity is commonly used in weather forecast, which reflects the possibility of rain and fog. In hot weather, high relative humidity will make people feel hotter, so the heat index can be calculated.

2. Biology

In biology, especially in ecology, air humidity is a very critical quantity, which determines the composition of an ecosystem. Some animals, such as snails, can only absorb oxygen when the skin has a certain humidity.

3. Storage and production

In the warehouse where fruits are stored, humidity determines the maturity of fruits, while in the warehouse where metals are stored, too high humidity may lead to corrosion. Many other commodities, such as chemicals, cigarettes, wine, sausages, wood, artworks, integrated circuits, etc. It must also be stored at a certain humidity or zero humidity.

Therefore, in many warehouses, museums, libraries, computer centers and some factories (such as microelectronics industry), there are air conditioning devices to control indoor humidity.

4. Agriculture and forestry

Low humidity in foggy forests will lead to water loss and yield reduction of soil and plants in agriculture.

In the sawmill, people often water the wood piled there. Wood itself has its own humidity, and its humidity in the air gradually approaches that of the surrounding air. The change of humidity in this kind of wood will lead to the change of wood volume, which is very important for forest industry.

China News Network-Winter in the south is wetter and colder than that in the north? Expert: The relative humidity is different.

Baidu encyclopedia-air humidity