Moisture
Moisture is the presence of a liquid, especially water, often in trace amounts. Small amounts of water may be found, for example, in the air, in foods, and in various commercial products. Moisture also refers to the amount of water vapour present in the air.
Moisture, or water vapour, is an extremely important constituent of the atmosphere. ... A cloud will form when air is cooled sufficiently to reach its condensation point. Cooling usually takes place through the rising of air. If the air is humid, air will soon reach the condensation level and clouds will form .
How much moisture is in the atmosphere?
The water-vapour content of the atmosphere varies from place to place and from time to time because the humidity capacity of air is determined by temperature. At 30 °C (86 °F), for example, a volume of air can contain up to 4 percent water vapour. At -40 °C (-40 °F), however, it can hold no more than 0.2 percent.
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