QS Study

Absolute humidity- At a particular place and at a particular time the mass of water vapour present per unit volume is called the absolute humidity. Normally water vapour present in one unit volume of air indicates absolute humidity.

“Absolute humidity of air is 10-2 kg-m-2; it means that 1 m3 of air contains 10-2 kg of water vapour.

Absolute humidity is the mass of water vapor divided by the mass of dry air in a definite volume of air at a exact temperature. The warmer the air is, the more water it can absorb. Absolute humidity is the measure of water vapor or moisture in the air, regardless of temperature. Absolute humidity is the determine of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).

The maximum absolute humidity of warm air at 30°C/86°F is approximately 30g of water vapor – 30g/m3. The maximum absolute humidity of cold air at 0°C/32°F is approximately 5g of water vapor – 5g/m3.

This would be the differential between humidity in the summer months versus the humidity in the winter months. Warmer air holds more water, whereas colder air holds less water.

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