These old units are common in engineering applications across North America, the US especially. When I was in chemical engineering school, we had to be effectiv

These old units are common in engineering applications across North America, the US especially. When I was in chemical engineering school, we had to be effectively bilingual in terms of units. We even used some bizarre units like the lb-mol, defined as the number of atoms in 12 lbs of carbon-12 (ie 454 times more than a gram mol).