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Why is dry bulb almost always warmer/higher tempature then the wet bulb?

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Why is dry bulb almost always warmer/higher tempature then the wet bulb?

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  1. Evaporation. The lower the relative humidity is the faster the water evaporates which has a cooling effect on the bulb. When the relative humidity is 100% there would be no evaporation and the bulbs would be the same temperature.

    The following site has some earlier "Hygrometers" that were used to determine relative humidity.  http://physics.kenyon.edu/EarlyApparatus...   ...Good Luck...

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