Answer:A sling psychometer has a wet and dry bulb from monitors place side by side the dry bulb thermometer registers the surrounding air temperature. The wet bulb thermometer which is covered by small wet cloth will usually register cooler temperature because of cooling caused by evaporation of moisture from a wet cloth. The rate at which evaporation occurs depends on the saturation of a surrounding air. If the air is heavily saturated the cooling will be minimal however if there is air is dry the cooling will be greater as more evaporation occurs.
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