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Encyclopedia > Psig

Pounds-force per Square Inch (PSI) is a non-SI unit of pressure

1 psi approximately equals 6.895 kPa.

Atmospheric pressure is approximately 14.7 psi.

For technical accuracy, psi must be expressed as psig (pounds-force per square inch gauge) or psia (pounds-force per square inch absolute; that is, gauge pressure plus sea level atmospheric pressure, or psig plus approximately 14.7 psi). psig can be further subdivided into psivg (psi vented gauge) and psisg (psi sealed gauge), the difference being that psisg measures the difference in psi between a chamber of air sealed at atmospheric pressure and the pressure at the measuring point, while psivg measures the difference between the measuring point and the local pressure. Sometimes psid (psi difference) is seen; this should always refer to a measurement of the difference between two pressures. A kludge unit, ksi = 1000 psi, combining a SI prefix with a non-SI unit, is occasionally seen in materials science and mechanical engineering. It is commonly used to specify stresses and Young's modulus.

• Conversion Calculator for Units of Pressure (http://www.ex.ac.uk/trol/scol/ccpress.htm)
• Pressure measurement primer (http://www.aeroconsystems.com/electronics/Pressure_transducer_basics/Transducer_primer.htm)

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 W3C Patents and Standards Interest Group (175 words) The Patent and Standards Interest Group (PSIG), part of the W3C Patent Policy Activity, is a forum for W3C Members and Invited Experts to discuss policy issues regarding the implementation of the W3C Patent Policy as well as new Patent-related questions that arise which require action or attention from the W3C Membership. The PSIG has no authority to create new policy or issue binding interpretations of the existing Patent Policy. However, input from the PSIG on the operation of the policy and areas that might require further policy development by a W3C Working Group is welcome.
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