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Amount of Moisture content in air

by Dasa . 27 No 2021

The amount of moisture content in the air can be represented in four ways, as illustrated below.

Mass of Water vapour Based on Mass of Dry Air Based on Volume of Dry Air % of Water Vapour with respect to Saturation Based on Mass of Dry Air Based on Volume of Dry Air

Humidity Ratio/Specific Humidity(HR):
The mass of water vapour carried by 1 lb of dry air.
= mass of water vapour / unit mass of dry air
= lb / lb of Dry air

Absolute humidity:
The mass of water vapour carried by 1 ft3 of dry air.
= mass of water vapour / unit volume of air
= lb / ft3 of Dry air
The same can be expressed in grains.
= grains of water vapour / unit volume of air
= grains / ft3 of Dry air
1 lb of water = 7000 grains

Degree of saturation:
The mass of water vapour carried by lb of dry air compared to the mass of water vapour carried by 1lb of saturated air.
= mass of water vapour / unit mass of dry air ÷ mass of water vapour / unit mass of saturated air @ same temperature.
= lb / lb of Dry air ÷ lb / lb of Saturated air

Relative Humidity (RH):
The mass of water vapour carried by 1ft3 of dry air compared to the mass of water vapour carried by 1ft3 of saturated air.
= mass of water vapour / unit volume of dry air ÷ mass of water vapour / unit volume of saturated air @ same temperature.
= lb / 1ft3 of Dry air ÷ lb / 1ft3 of Saturated air


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