[Dimman]

Originally Posted by bambbrose

I believe "unity" in this case means constant. Unity can be defined as "unvaried", and therefore can be said to be constant.

I'm sure for the formula to work, you have to hold the coefficient constant, otherwise there are too many unknowns.

Coefficent of flow = fluid friction, or "the resistance to flow", in layman terms.

Would the pressure difference between the hot exhaust gases and whatever pressure is left in the exhaust affect the speed of the gas as well?