On Thu, 9 Mar 2006 at 16:56:45 in message
, Jose
wrote:

Pressure is sufficient for lift. but a perfectly incompressible fluid
is an ideal that does not exist. The electrons get squished a little
harder; that supplies the force. Granted this is not important in the
calculation of what pressure does, and the distances involved are less
than miniscule, but it is important conceptually in seeing "just how
things work" on a basic level. "It goes =somewhere=."

No metal that is incompressible exists either. The point is lost about
the fundamentals of Bernoulli' theorem. Compressibility is not a part of
the simple theory and it applies just as much to water in pipes.

If water flows through a pipe and comes to a place where the pipe
narrows smoothly then the water speeds up as the mass flow through a
pipe is constant along its length. The pressure then drops as some of
the pressure energy is transformed into kinetic energy. Many measurement
devices depend on this as do carburettors. The keels and rudders of
boats generate lift in just the same way as wings.
--
David CL Francis