Percentage of moisture in atmospheric air

The moisture content in atmospheric air is usually expressed in terms of "relative humidity", that is, the amount of water vapor actually contained in the air as a percentage of the maximum water capacity of the air at that temperature. For example, a relative humidity of 60% means that the current amount of water vapor in the air is 60% of the maximum amount of water vapor that the air can hold at the same temperature.

In the actual environment, the relative humidity of atmospheric air is greatly affected by temperature, geographical location and weather. In general, the indoor environment relative humidity between 40%-70% is more common, and the outdoor environment may be due to the season (such as the rainy season humidity is higher) or climate (such as coastal areas of high humidity) greater fluctuations.

It should be noted that the relative humidity is not a fixed value. When the temperature rises, the water capacity of the air increases, even if the water vapor amount remains the same, the relative humidity will decrease; on the contrary, when the temperature drops, if the water vapor amount does not decrease, the relative humidity may increase or even reach saturation (100), at which time the water in the air will condense into liquid water.

For industrial scenarios that rely on compressed air (such as spraying, packaging, electronics manufacturing), the moisture in the air needs to be a major concern. During the compression process, the increase in air temperature leads to an increase in water vapor content, which may condense into liquid water after cooling. If it is not treated in time, it may affect the operation of the equipment (such as pipeline corrosion) or product quality (such as spray surface defects). Grantklin air compressors can provide reliable support for scenarios that require dry air sources through oil-free design and stable air supply characteristics, but specific moisture control still needs to be combined with post-processing equipment (such as dryers).