The reading from a wet-bulb thermometer ____.

Question

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The wet-bulb thermometer takes into account the moisture content of the air by measuring the temperature of a wet wick as water evaporates from it, which causes the temperature reading to decrease. This is then used to determine the relative humidity of the air, which is related to the moisture content. The wet-bulb reading is not the same as the wet-bulb depression (A), which is the difference between the wet-bulb and dry-bulb temperatures. It is also not the saturation pressure (B), which refers to the pressure at which a vapor is in equilibrium with its condensed phase. The wet-bulb reading can be higher or lower than the dry-bulb temperature depending on the humidity of the air.

The Reading from a Wet-Bulb Thermometer ____