Temperature and Moisture Holding Capacity of Air

The moisture holding capacity of air varies with temperature

The moisture holding capacity of air depends on the air's temperature. As you can see this diagram the capacity increase dramatically with increasing temperature.

Air Moisture Holding Capacity - SI Units

Air moisture holdeing capacity - lb water per lb dry air:

Air Moisture Holding Capacity - Imperial Units

Air moisture holdeing capacity - kg water per kg dry air:

Air moisture holdeing capacity - kg water per 1000 cubic feet dry air:

Note that at 100^oF (38 ^oC) the capacity is 10 times the capacity at 30^oF (~ 0 ^oC) . This is a very important observation, especially working with dryers where air is common used for transporting the moisture away from the product.

In general, it is good energy economy to increase the temperature in the dryer as much as possible, because the increased moisture transport capacity of the air at higher temperatures out weights the increased energy consumption for heating the dry air.

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