**Dry Bulb Temperature**: ($T_{db}$​ or $T$): The commonly used measurement for [[Air|air]] [[Temperature|temperature]], measured using a dry [[Thermometer|thermometer]]. **Wet Bulb Temperature**: ($T_{wb}$​): The temperature of the air measured by a thermometer covered with a wet cloth. It is the lowest possible temperature of the air that can be achieved solely by evaporating water. $T_{wb}$​ will always be lower than or equal to $T_{db}$.