# 1 Bar = ?

by BMcN
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 P: 11 What the conversion for bar so that I can use it to work out volume and temprature? Whats the units?
 P: 837 1 bar = 100,000 pascals = 100,000 kg/m/s2
 P: 11 Bit higher than I remember, but thanks!
Emeritus
PF Gold
P: 10,429
1 Bar = ?

 Originally posted by Ambitwistor 1 bar = 100,000 pascals = 100,000 kg/m/s2
Should be kg/m-s2

- Warren
 P: 837 Either way works.
 Emeritus Sci Advisor PF Gold P: 10,429 Not to be a pain in the ***, but I'd normally think kg/m/s^2 = kg s^2 / m But I guess it does come down to the conventional order of operations. I guess you win. Gack. I personally hate when people describe accelerations as "meters per second per second" i.e. m/s/s, for the same reason. - Warren
 Sci Advisor HW Helper P: 1,772 Interesting note: In the "common" world, a bar has the unit "kg/cm^2". THis is referring to the weight of one kilogram per square centimeter. THis of course translates to only 98,010 N per square meter, but somewhere along the line, "g" got upgraded to 10 N/kg instead of 9.801 N/kg.
 Sci Advisor P: 875 So what is it in hpdpcf's (horsepower-decades per cubic furlong)? Njorl
Emeritus
PF Gold
P: 10,429
 Originally posted by Chi Meson Interesting note: In the "common" world, a bar has the unit "kg/cm^2". THis is referring to the weight of one kilogram per square centimeter. THis of course translates to only 98,010 N per square meter, but somewhere along the line, "g" got upgraded to 10 N/kg instead of 9.801 N/kg.
Uh.... no.

1 bar is defined to be 100 kilopascals. A pascal is one newton per square meter. One kilogram-force is g newtons. Therefore, one pascal is (1/g) kilogram-force per square meter. Therefore, one bar is 100,000/g kilograms-force per square meter.

g is accepted to be 9.80665 m/s^2, so one bar is 10,197.1621298 kilograms-force per square meter.

I have no idea where you got the idea that someone rounded g to 10 m/s^2, but it never happened.

- Warren
P: 837
 So what is it in hpdpcf's (horsepower-decades per cubic furlong)?
1 bar = 3.4595574 hpdpcf's
Emeritus
PF Gold
P: 10,429
 Originally posted by Ambitwistor 1 bar = 3.4595574 hpdpcf's
I see your Schwartz is as big as mine.

 P: 837 I used the Unix 'units' program, since I had a shell already open ... \$ units 2084 units, 71 prefixes, 32 nonlinear units You have: bar You want: horsepower-decade/furlong^3 * 3.4595574 / 0.28905432