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Gilles,
I would like to make another admission - improved version:
In interpreting pressure-flow-restriction graphs and estimating pressure 
drops it is useful to know that flow through a restriction is 
proportional to the square root of the pressure drop across it. I 
earlier assumed erroneously that Ohm's law applies with pressure / flow 
equivalent to voltage / current. Square root of pressure / flow comes 
closer to being equivalent to voltage / current.
Sorry about the confusion.
Cheers,
Jan de Jong
#461
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