Temperature and Moisture Holding Capacity of Air

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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 holding capacity - kg water per kg dry air:

Air Moisture Holding Capacity - Imperial Units

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

Air moisture holding capacity - lb 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 for the transport of moisture away from the product.

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

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Related Topics

• Air Psychrometrics - The study of moist and humid air - air condition - psychrometric charts, Mollier diagrams, air temperature, absolute and relative humidity, moisture content and more .
• Steam and Condensate - Steam & condensate properties - capacities, pipe sizing, systems configuration and more
• Thermodynamics - Thermodynamics of steam and condensate applications

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• Air Conditioning - Cooling and Condensate Generated - Water condensate in air conditioning systems
• Drying Force of Air - The Drying Force of air may be expressed as the moisture holding capacity of the air and the evaporation capacity from a water surface to the air
• Heat Removed by Air - Heat removed with air - dry and wet bulb temperature