![]() ![]() When gauge pressure is referenced to something other than ambient atmospheric pressure, then the units would be pounds per square inch differential ( psid). For example, a bicycle tire pumped up to 65 psig in a local atmospheric pressure at sea level (14.7 psi) will have a pressure of 79.7 psia (14.7 psi + 65 psi). ![]() The converse is pounds per square inch gauge ( psig), indicating that the pressure is relative to atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi (101 kilopascals), this will be added to any pressure reading made in air at sea level. Pounds per square inch absolute ( psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. In SI units, 1 psi is approximately equal to 6895 Pa. It is the pressure resulting from a force of one pound-force applied to an area of one square inch. The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in 2 abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units. A pressure gauge reading in psi (red scale) and kPa (black scale) ![]()
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