The pound per square inch or, more accurately, pound-force per square inch (abbreviations: psi, lbf/in2, lbf/in2, lbf/sq in, lbf/sq in) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch: Therefore, one pound per square inch is approximat...
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http://en.wikipedia.org/wiki/Pounds_per_square_inch
[
n] - a unit of pressure
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http://www.webdictionary.co.uk/definition.php?query=pounds%20per%20square%2
Often abbreviated as psi. This is a British imperial unit of pressure. 1.0 psi = 6894.757 Pattle='Pressure';xiunt='Pa';yiunt='psi';mconv=6894.757;cconv=0.0;There are a number of other abbreviations appended to psi:psia = pounds-force per square inch absolute = gauge pressure plus local atmospheric pressure.psid = psi difference = difference between...
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https://www.encyclo.co.uk/local/20687
psi noun a unit of pressure
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https://www.encyclo.co.uk/local/20974
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