What is the concept of 90% humidity?

Humidity refers to the content of water vapor in the air, usually expressed as a percentage. When the humidity reaches 90%, it means that the water vapor content in the air is very high and the air is already very humid. Humidity has a great influence on biological comfort. In addition, high humidity will also lead to the growth of bacteria and mold, aggravate indoor air pollution, and pose a threat to the organism itself.

In meteorology, 90% humidity is usually considered as a high value of relative humidity. Relative humidity refers to the ratio of the actual content of water vapor contained in the air to the saturated content of water vapor at this temperature. When the relative humidity reaches 100%, the water vapor in the air has reached saturation, and then fog, dew and frost will appear.

Significance and use of humidity

1, Meteorology and Hydrology: When it rains, the air humidity is very high. In meteorology and hydrology, humidity is an important data to determine evaporation and transpiration. It plays a decisive role in the formation of different climatic zones. Water vapor in the atmosphere is also essential in the water cycle. Water forms precipitation, clouds and other phenomena in the atmosphere, which determine the weather and climate of the earth.

2. Storage and production: In the warehouse where fruits are stored, humidity determines the maturity of fruits. Excessive humidity may lead to corrosion in warehouses where metals are stored. 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.

3. Architecture: Dew point is a very important quantity in architectural physics. If the temperature in the building is different, the water in the humid air flowing from the high temperature part to the low temperature part may condense. These places may take shape, and architectural design must take this phenomenon into account.

Refer to Baidu Encyclopedia-Humidity for the above contents