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I was recently working with some of the pressure units and noticed that the definitions for psi and pound_force_per_square_inch differ. Is this intentional? I thought these should just be synonymous. The latter seems to have much more precision.
After some digging I'm not sure the exact reason both definitions exist. There wasn't any discussion about it in #79 and I'm guessing that because NIST has both listed we added both. The duplication may also be to allow for both the lbf/in² and psi abbreviations.
Note that in NIST 811 appendix B.9 neither entry is exact (not in bold face) and is limited by significant figures. pound_force_per_square_inchis included in the test at the bottom of the file which compares against the derived conversion factor using pound_force and square_inch. psi isn't explicitly tested.
I'll leave the issue open as something like the following should be done:
Clarify/document the duplication, ensure there is consistent guidance to follow if the issue arises for other units.
Greetings!
Nice project, fun to work with!
I was recently working with some of the pressure units and noticed that the definitions for
psi
andpound_force_per_square_inch
differ. Is this intentional? I thought these should just be synonymous. The latter seems to have much more precision.uom/src/si/pressure.rs
Line 97 in d385d79
uom/src/si/pressure.rs
Line 95 in d385d79
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