Dave Finkelnburg on tue 7 jan 03
The "mathematical relationships you ask about is this. A pound-force
per square inch produces a pressure about equal to a column of water 27.7
So 1/2-PSI is closer to 14-inches of Water Column, 1/4-PSI is just a
little less than 7-inches of Water Column.
----- Original Message -----
> OK... In "The Art of Firing", Nils Lou writes that 6" water column
> is the equivalent to about 1/4 (PSI). I've noticed that the 'water column
> pressure is usually used for natural gas and (PSI) for propane. I'm
> that this is because natural gas is usually a lower pressure then propane.
> There must be like a mathematical relationship to these two measurements?