Recall that most of the units of measure in both the Imperial and SAE systems were "defined" long before the actual physical properties and relationships they were intended to measure were adequately understood. For a real hoot, try to find a single definition in either system for "standard conditions". I often run into situations where I must do temperature compensations when converting from scfm to scfm, because one "standard cubic feet per minute" was measured assuming "standard" means 1 atmosphere at the freezing point of water, and another "standard cubic feet per minute" was for 1 atmosphere at 67 degrees Farenheit. And, then, there's "standard" meaning maximum density of water, "standard" meaning 20 degrees Centigrade, ...
And I was brought up to believe that measurement was an exact science.
Whimper; sniff, sniff. |
