[Ophiucus]

And you are still wrong as to the bar being part of the so-called “SI”. It is not.

Please pay attention. I never discussed bars. I answered the question as to what are SI units.

Science crosses borders. Get used to it.

[Olog-hai]

Insofar as you called the millibar “SI” in post 2, you discussed bars, what with one millibar = ¹⁄1000 bar. Neither the bar nor its subdivisions are SI/metric.

Your latter statement seems to display some lack of knowledge of science. As far as weights and measures go, uncertainty plagues them more frequently than other scientific disciplines due to the necessity of common use. US law comes to bear here, since it is the job of Congress alone in the USA to assign weights and measures; this cannot “cross borders” but by definition has to stay within US borders. Any “international standard” that purports to be such is a political animal rather than scientific.