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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Wet bulb, dry bulb Q.
A.
The wet-bulb is a regular thermometer with a wet (distilled water) muslin wick covering it, and brisk air flow across the wick (600 feet per minute). As a result of evaporative cooling, the W-B temperature will be cooler than the D-B temperature. If you know the D-B and W-B temperatures, you can look up relative humidity (RH), equilibrium moisture content, dew point, etc. This relationship was established in about 1909 by the U.S. Weather Bureau -- I think the scientist's name was Marvin.
About the wet-bulb temperature: As Gene stated, the wet-bulb temperature will be lower than the dry-bulb temperature because of evaporative cooling (assuming less than 100% RH). The difference between the dry-bulb temp and the wet-bulb temp is known as the "depression." The larger the depression (larger difference between wet- and dry-bulb), the lower the RH.
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