![]() Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types. You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.Ĭonversion calculator for all types of measurement units. The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. Thus a reading of 30 psig on a tire gauge represents an absolute pressure of 44.7 psi. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.7 psi. Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. At sea level, Earth's atmosphere actually exerts a pressure of 14.7 psi. By contrast, psia measures pressure relative to a vacuum (such as that in space). Psig (pound-force per square inch gauge) is a unit of pressure relative to the surrounding atmosphere. Note that rounding errors may occur, so always check the results. ![]() You can view more details on each measurement unit: Pa or psi The SI derived unit for pressure is the pascal. ![]() Psi to psig, or enter any two units below: Enter two units to convert From: We assume you are converting between pascal and pound/square inch. Ft/s) 0 initialization pressure - normal atmospheric pressure (mbar, mmHg)Example 1: Convert 20 SCFM of air to ACFM at a vacuum level of 25 Hg at sea. You can do the reverse unit conversion from ![]()
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