Dry-bulb Temperature


Temperature measured by a thermometer not affected by the evaporation of water. Relative humidity is measured by finding the difference between wet-bulb and dry-bulb temperature. The thermometer that measures wet-bulb temperature has a wick around its sensitive end. This wick is saturated with water, and air blown across it evaporates the water. The evaporation causes the wet-bulb temperature to be lower than the dry-bulb temperature, and the amount lower is determined by the humidity, or the amount of water vapor in the air.


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