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 holding capacity - kg water per kg dry air:

air moisture holding capacity si units

Air Moisture Holding Capacity - Imperial Units

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

air moisture holding capacity si units

Air moisture holding capacity - lb water per 1000 cubic feet dry air:

air moisture holding capacity si units

Note that at 100oF (38 oC) the capacity is 10 times the capacity at 30oF (~ 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.

Related Topics

  • Steam and Condensate - Steam & condensate properties - capacities, pipe sizing, systems configuration and more
  • 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
  • Thermodynamics - Thermodynamics of steam and condensate applications

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