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A sling psychrometer is a type of hygrometer that measures relative humidity. It consists of two thermometers, one of which has a wet bulb that registers a lower temperature due to the cooling effect of evaporation. The instrument is swung around to allow the water to evaporate. The difference in temperature indicates the relative humidity.
Source:
National Aeronautics and Space Administration: Weather Instruments to Make: Sling Psychrometer
U.S. Centennial of Flight: Psychrometer
Resource:
USA Today: Weather: How a Sling Psychrometer Works
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