ENVIRSC 1C03 Lecture Notes - Lecture 7: Dew Point, Fluid Parcel, Humidity
13 Feb 2017
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Document Summary
It is the amount of water vapour in the air. Warm air can hold more water vapour than cold air so humidity varies over the earth. Latitudes closer to the equator experience higher atmospheric temperatures , meaning more humidity- this favours the growth of lush tropical vegetation: the poles have low humidity- dry environments. Absolute humidity: humidity refers to water vapour only and not to solid or liquid states of water e. g. ice snow or rain, absolute humidity is the mass of water vapour or volume or air. Not used commonly cause air volume changes a lot: a change in air volume does not mean that the air moisture has changed. If we increase a parcels volume its humidity would decrease. If we decrease a parcels volume its humidity would increase: there changes in air volume (caused by pressure, or temperature) affects absolute humidity- even if the vapour content has not changed.
