The rate at which water will evaporate from the wick on the wet-bulb thermometer is determined by the moisture content of the surrounding air.

Question

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The rate of evaporation from the wet-bulb thermometer's wick depends on the humidity of the air surrounding it. As the surrounding air becomes more saturated with moisture, the evaporation rate decreases, and as the air becomes drier, the evaporation rate increases.

The Rate at Which Water Will Evaporate from the Wick