[USMA:36441] Re: Is the bar a metric unit?

[Martin Vlietstra]

The purists would insist on using the Pascal, bu tthe bar has the status od "Other non-SI units currently accepted for use with the Internartional System", giving it the same status at the hectare, the knot, the nautical mile, the are, barn and Ångström.  The SI handbook does not encourage the use of these units, but they "satisfy the needs of commercial, legal and specialized scientific interests".   ----- Original Message ----- From: Mike Millet To: U.S. Metric Association Sent: Sunday, April 02, 2006 7:47 AM Subject: [USMA:36438] Is the bar a metric unit? I was watching a show the other day where an engineer mentioned the pressure in a tank was 250 bar. I thought about it for a minute and I remember hearing that the unit of pressure in SI was the Pascal.  However, we measure pressure in millibars (or inches if you want to be really old fashioned) Is the bar an SI unit? or is it one that was adopted into SI? Would it be correct from a metric engineering standpoint to use the bar or would Pascal be correct :)? Mike -- "The boy is dangerous, they all sense it why can't you?"