A sling psychrometer is a device to measure the humidity
Chapter 8, Problem 8.71(choose chapter or problem)
A sling psychrometer is a device to measure the humidity of air. A porous cloth (the wick) is wrapped around the bulb of a mercury thermometer, which is then whirled around in the air. As the water in the wick evaporates, the temperature of the thermometer bulb drops, and finally stabilizes at the wet-bulb temperature of the air. The dry-bulb temperature is read from a second thermometer mounted on the sling. One summer day, the weather bureau reports a temperature of 33e and a relative humidity of 40%. You wipe the sweat from your forehead and remark to a friend that you'd bet $5 that the report is wrong, and the relative humidity is higher than 80%. He immediately puts a $5 bill on the table, accepting your challenge. You bring out your sling psychrometer, whirl it around, and read a dry-bulb temperature of 35e and a wet-bulb temperature of 27e. Who wins the bet?
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