I don't want people to think of me as a critical bastard. It's just that too many people believe that gravity means something in a closed system or even in an open system. Any system that uses a single non-compressible fluid (this can be a mixture as long as the components don't separate) gravity has no effect. It's purely down to flow resistances, which give rise to back pressures.And to pumps which give forward pressures.
Edward
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