Absolute air humidity describes the volume of water present in the air, expressed as grams per cubic meter. Absolute humidity does not depend on the temperature and provides information on the actual quantity of water vapor in the air.
In contrast, relative humidity is far more important for the shipment of products. Air can only accommodate a certain volume of water before becoming "saturated". This property is dependent on the temperature of the air: Hot air can hold more water vapor than cold air. This is where the relative humidity steps in. It represents the ratio between absolute humidity relative to the potential saturation volume and hence expresses how full the air is at a particular temperature. The temperature-dependence of relative humidity means that its value rises sharply when the temperature falls at constant absolute humidity, as the capacity of the air also drops at lower temperatures.
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