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New Floor Pump(11 posts)

New Floor PumpScot_Gore
Jan 9, 2002 3:05 PM
I purchased a new floor pump today.

It has two scales on it.

One is PSI - I know what that is.

What's bar? barometric pressure, something metric.

Yours Sincerely
Confused non-metric American
1 bar=14.50377 psi (nt)Luis
Jan 9, 2002 3:24 PM
OK, I see that.....Scot_Gore
Jan 9, 2002 3:37 PM
10 bar lines right up with 145psi, but, what's a bar. Is it metric, how do you use it, do tires come with bar ratings (going to look now), do you Europeans think I'm a bonehead for asking.

Sincerely
guy hoping he's not sounding like flame bait
Sure enough....Scot_Gore
Jan 9, 2002 3:41 PM
there it is right on my tire, 8-8.5 BAR, never noticed it before.

Scot
Not completely clearKerry Irons
Jan 9, 2002 5:15 PM
One atmosphere pressure at sea level = 14.696 psi. One bar is sort of one atmosphere = 14.5 psi. Close enough for cyclists, but not even close for engineers. I've asked a number of folks why a bar doesn't equal an atmosphere, and never gotten an answer. Maybe somebody in the alps set the figure? Metric pressure is pascals, more typically kilo pascals, and if you'll go out to your car RIGHT NOW, you'll see from the sidewall markings that its about 6.82 kPa per psi.
Sure Enough....Scot_Gore
Jan 9, 2002 5:48 PM
it says 300 KPA.

Sorry I took so long.

Scot
Standard atomsphereDCP
Jan 9, 2002 6:59 PM
I have got to think the difference is just a difference in what constitutes a standard atmosphere. Not much difference in temperature would account for the variation. It seems apparent that whoever decided what a bar was meant to make it one atmosphere.
A bar is a place where you get an adult beverageDCP
Jan 9, 2002 3:50 PM
That kind of bar is barometric pressure. I believe that one bar is the "normal" barometric pressure on a standard day at sealevel. Slightly more obvious to an average user that pounds per square inch or inches of mercury, which are other measures of the same thing.
and strike with women, but maybe that's just meScot_Gore
Jan 9, 2002 3:59 PM
Thanks,

So I'm pedaling around 16 days of pressure at sea level

No wonder I get so tired.

Again, thanks all

Scot
I mean "strike out" NMScot_Gore
Jan 9, 2002 4:00 PM
re: New Floor PumpSnowBlind
Jan 9, 2002 3:54 PM
1 "Bar" is the pressure of the atomosphere at sea level. It is a very old measurement, not metric. metric is Kilo per square centimeter.