This quantity is measured by a hygrometer and is found by relating the partial pressure of water vapor to the vapor pressure of liquid water. This quantity is maximized when the air temperature is equal to the dew point, when condensation will occur. It is often given as a (*) percentage in weather reports, where it is combined with temperature to 
This quantity is measured by a hygrometer and is found by relating the partial pressure of water vapor to the vapor pressure of liquid water. This quantity is maximized when the air temperature is equal to the dew point, when condensation will occur. It is often given as a (*) percentage in weather reports, where it is combined with temperature to calculate the heat index. For 10 points, give this measure of the level of water vapor in the air.
This quantity is measured by a hygrometer and is found by relating the partial pressure of water vapor to the vapor pressure of liquid water.
relative humidity