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To: cymbeline
The air exiting the turbine has lower energy than the air entering the turbine. Do you disagree?

No. Velocity is not an energy level.

Velocity gives potential energy, relative to other objects, similar to gravity if an object is raised above a surface.

Unless an object interacts with another object at a different velocity, there is no difference than being at rest.

The mass of air moving at 50 mph only has potential energy to striking objects at rest. The air molecules colliding with other air molecules traveling at the same speed are no different in potential energy than those at zero velocity.

Those same air molecules are spinning at velocity with the earth's rotation, as well as around the sun. Velocity only has meaning in relative terms to other objects. It does not raise or lower the temperature of the object.

50 posted on 05/02/2012 4:48:58 AM PDT by thackney (life is fragile, handle with prayer)
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To: thackney

“Velocity is not an energy level” - no, velocity is kenetic energy - the energy of motion.

“Velocity gives potential energy” - potential energy is the energy “no motion”. A lifted weight has potential energy that will be given up as it falls to a lower level.

A molecule of air hitting a moving turbine blade is like a ball hitting an object that is moving away from the ball. The ball after impact will have a slower speed than before, and the object will have hibher higher speed. Energy is transferred from the ball to the car.

With a gas, velocity, or let’s say speed which does not have an associated direction, is thermodynamically equivalent to temperature.


51 posted on 05/02/2012 7:17:47 AM PDT by cymbeline
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