"Robatoy" wrote in message
oups.com...

Water vapour condenses when the water/air mixture is
compressed...ASSUMING the temperature stays the same...which it won't
as air temperature increases when the pressure does during
compression...... so we wait till it cools to the original ambient
inle temperasture.... then it condenses.

Water vapor condenses regardless of pressure. Ever take a glass of ice
water out side on a hot humid day? You get condensation on the cool sides
of the glass. The condensation is formed when the humid air that has been
heated up during compression, enteres the cooler compressor tank.

You can transfer humid compressed air to another container and there will
be no condensation inside the tank as long as the temperature remains the
same. Have you ever wondered why portable air tanks seldom if ever have no
bleeder valve for releasing water?