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The definition of humidity: the less water vapor contained in a specific volume of air at a certain temperature, the drier the air; the more water vapor, the more humid the air. The degree of humidity of the air is called "humidity." In this sense, it is usually expressed by physical quantities such as absolute humidity, relative humidity, relative humidity, mixing ratio, saturation difference, and dew point; if it represents the weight of liquid water in wet steam as a percentage of the total weight of steam, it is called steam Humidity. 

The instrument used to measure and record humidity is called a humidity recorder. 

The effects of humidity on agriculture and forestry are as follows:

1. Too low humidity in misty forests can cause soil and plants to lose water and reduce production in agriculture.

2. Humidity is also a very critical quantity in the forestry and forestry industry. At the sawmill, people often water the wood stacked there. The wood itself has its humidity, and its humidity in the air gradually approaches the humidity of the surrounding air. Changes in the humidity in the wood will cause changes in the wood volume, which is critical for the forest industry.

3. Generally, when storing wood, the air should be in direct contact with it in all directions to prevent the wood from being deformed or moldy. When laying the floor, it is best to let the wood stand for a day or two to make it the same as the humidity in the house. Otherwise, the wood on the floor may stretch or shrink after laying.