For 10 points, name this quantity used in some hygrometers, the temperature to which air must be cooled at constant pressure in order to be saturated with water vapor.
It can be calculated from a temperature versus wet-bulb temperature graph, but to obtain an accurate measurement of it, the pressure must be held constant. If it falls below zero degrees Celsius, it is known as the frost point, and at 100% relative humidity, it will be equal to the current temperature. For 10 points, name this quantity used in some hygrometers, the temperature to which air must be cooled at constant pressure in order to be saturated with water vapor.
It can be calculated from a temperature versus wet-bulb temperature graph, but to obtain an accurate measurement of it, the pressure must be held constant.
{dew point}