The variable relative humidity is a measure of humidity relative to the temperature of the air. (Hint, hint!) Relative humidity measures how close the atmosphere is to a point of saturation.

This measures the temperature that liquid water ... You then compare this to a relative humidity chart to check the humidity level. PUPIL: The wet bulb temperature was two degrees Celsius.

A capacitor type of hygrometer is usually used to measure relative humidity. The sensor has a dielectric polymer layer that absorbs water molecules from the air through a thin metal electrode.