What is the convertion factor for barometric pressure to lbs/sq.in. ?



Answers:
1 PSI = 0.0689 Bar
1 Bar = 14.504 PSI
1 millibars = 2.08854342 pounds force / (square foot)

edit - you said sq inch. 1 millibars = 0.0145037738 pounds force / (square inch)
Quick & easy way - 1 bar = 15psi

it's close enough for automotive purposes!!
If you want to get technical and go to thousandths of an inch, look it up in a conversion table.
http://www.onlineconversion.com/.
Go to - Pressure - Atmosphere to PSI
1013mb is the standard atmospheric pressure at sea level, this equates to 14.8 psi, therefore 1psi = roughly 68.459 mb.

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