Chemistry people use "atmosphere" as a unit of measure. "1 atmosphere" or 1 atm as it's abbreviated is somewhere right around 15 pounds per square inch. It's a decimal value; this isn't a precise conversion and anybody who blows up their workshop using that calculation, it's not my fault.

But I suspect that "1 atmosphere" in some German or European language would have something to do with *barometric* pressure or a barometer, thus 1 "bar" = 1 barometric pressure unit = 1 atmosphere = 14.7psi.

Probably. Sorry if this is obvious to everybody but somebody might search for this years from now and wonder.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL