The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a <u>relative humidity</u> (RH) of 100%. At this point the air cannot hold anymore water in the gas form. If the air were to be cooled even more, water vapor would have to come out of the atmosphere in the liquid form, usually as fog or precipitation. The higher the dew point rises, the greater the amount of<u> moisture in the air.</u> <u>The lower the humidity, the lower the dew point.</u>
