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TRG-TRC001-EN 3
period one
The Psychrometric Chart
notes
Dry-bulb temperatures are read from an ordinary thermometer that has a dry
bulb.
Wet-bulb temperatures are read from a thermometer whose bulb is covered
by a wet wick. The difference between the wet-bulb temperature and the dry-
bulb temperature is caused by the cooling effect produced by the evaporation
of moisture from the wick. This evaporation effect reduces the temperature of
the bulb and, therefore, the thermometer reading.
Consequently, the difference between dry-bulb and wet-bulb temperature
readings is a measure of the dryness of air. The drier the air, the greater the
difference between the dry-bulb and wet-bulb readings.
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Figure 5
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Figure 6