If a substance exists entirely as vapor at saturation temperature, it is called saturated vapor.Sometimes the term dry saturated vapor is used to emphasize that the quality is 100%. Whenthe vapor is at a temperature greater than the saturation temperature, it is said to exist assuperheated vapor. The pressure and temperature of superheated vapor are independentproperties, since the temperature may increase while the pressure remains constant. Actually, thesubstances we call gases are highly superheated vapors.