On Wednesday 24 September 2008 14:54:06 Martin Vlietstra wrote: > Pierre, > > From my limited knowledge of hydraulics, but with a degree in physics, I > would suggest that the head should ideally be measured in pascals - after > all what you are measuring is a pressure. In the case of a static head, > you would use the equation > P = density x height x gravity.
Head isn't pressure. It's energy divided by a quantity of fluid. If the fluid were measured by volume, head would indeed have units of pressure, but there are other kinds of head, such as velocity head (kinetic energy divided by amount of fluid). Pierre
