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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%. When the vapor
is at a temperature greater than the saturation
temperature, it is said to exist as superheated
vapor. The pressure and temperature of superheated
vapor are independent properties,
since the temperature may increase while the pressure
remains constant. Actually, the substances
we call gases are highly superheated vapors.
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