Originally Posted by GreenPat
700rpm, for that matter?
or is that ppm, indicating 10% and 70% saturation (of air with gravel) respectively?
I think it was "parts per million"... perhaps "particles per meter"...? or maybe even passing "peppered" mates...??!
Whatever the correct formula might be Pat... i think his point is adequately illustrated by the the graphic photo, moreso than the graphics of his questionable physics...