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What is the moisture content in the air?

2026-04-15Views:

The moisture content in the air is not a fixed value. It is affected by many factors such as temperature, pressure, humidity, etc. The following is a detailed description from different angles:

moisture content in standard state

in the standard state (temperature is 0 ℃, pressure is 1 standard atmospheric pressure), the moisture content in the dry air is almost zero. But in the actual environment, the air always contains a certain amount of water vapor. In general, in the standard state, the typical value of moisture content in the air is about. 1000-3000ppm left and right.

Moisture content at different temperatures

  • low temperature environment: When the temperature is low, the ability of air to hold water vapor decreases. For example, at -10°C, the moisture content in the air may be as low 100-500ppm.
  • Normal temperature environment: In a normal temperature environment of 20 - 25 ℃, the moisture content in the air is usually 5000-15000ppm between.
  • high temperature and high humidity environment: In the case of above 30°C and high relative humidity, the moisture content in the air may exceed 30000ppm.

Moisture content at different humidity

  • low humidity environment: In a dry environment with a relative humidity of 30% - 40%, the moisture content in the air may be 3000-8000ppm.
  • High humidity environment: In a humid environment with a relative humidity of 80% - 90%, the moisture content in the air may reach 20000-30000ppm even higher.

Moisture content in special environment

  • desert region: The climate in desert areas is dry, and the moisture content in the air is usually low, which may be 1000-5000ppm.
  • tropical rain forest area: The tropical rain forest area has a humid climate and high moisture content in the air, which may reach 25000-35000ppm.

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