. Elementary physics and chemistry: second stage. Science. Fig 13—trust figure-on a window p^ne Effects of the water vapour in the air.—It is important for some purposes that the exact amount of water vapour in the air should be known. For instance, the " dryness " or " wetness " of the air has a very great influence upon health. Some persons are unable to keep in good health in a damp atmosphere. For this, and other reasons, it is often necessary to find out exactly how much water vapour the air contains. But it must not be supposed from this statement that the actual quan
. Elementary physics and chemistry: second stage. Science. Fig 13—trust figure-on a window p^ne Effects of the water vapour in the air.—It is important for some purposes that the exact amount of water vapour in the air should be known. For instance, the " dryness " or " wetness " of the air has a very great influence upon health. Some persons are unable to keep in good health in a damp atmosphere. For this, and other reasons, it is often necessary to find out exactly how much water vapour the air contains. But it must not be supposed from this statement that the actual quantity of such moisture in the air decides whether the air is damp or dry. Air which/c^/.f damp may really only contain a small amount of vapour, and perhaps very much less than air which feels dry. Air feels dry when it contains considerably less ivater vapour than it is capable of holding. Damp air has as much, or nearly as viucli, water vapour as it can possibly take Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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