(HP 382) > Wood
Psychrometric Chart and Humidity
A chart consisting of lines and curves that shows the relationship
between temperature, humidity and air volume. From the psychometric
chart reading, a variety of information can be obtained, including
the specific humidity, dew point, vapor pressure, and wet-bulb
temperature (all on Wikipedia).
Advice Glossary, Disaster Advice.
|It is important to realize that what is normally
referred to as "humidity" is actually relative humidity.
It is a measure of the amount of water vapour present in the
air expressed as a percentage of the maximum amount that theair
can hold at that particular temperature. When the temperature
is changed, the relative humidity changes, since the capacity
of the air for holding moisture increases with increasing temperature.
These relationships are most conveniently represented graphically
in psychrometric charts (for sea level). Such a chart is shown above in simple form.
CBD-1 Humidity in Canadian Buildings by N. B. Hutcheon,
Canadian Building Digests, National Research Council Canada