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reading in PSI (red scale) and kPa (black scale)The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/sq in) is a unit of pressure or of stress (physics) based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch:

1 lbf/sq in ≈ 6,894.757 pascal (unit) (the SI unit of pressure).

Relation to other measures Other abbreviations are used that append a modifier to "psi". However, the US National Institute of Standards and Technology recommends that, to avoid confusion, any modifiers be instead applied to the quantity being measured rather than the unit of measure For example, "Pg = 100 psi" rather than "P = 100 psig".

• psia (pounds-force per square inch absolute) - gauge pressure plus local atmospheric pressure. Replace "x psia" with "Pa = x psi".
• psid (psi difference) - difference between two pressures. Replace "x psid" with "ΔP = x psi".
• psig (pounds-force per square inch gauge). Replace "x psig" with "Pg = x psi".
• psivg (psi vented gauge) - difference between the measuring point and the local pressure. Replace "x psivg" with "Pvg = x psi".
• psisg (psi sealed gauge) - difference between a chamber of air sealed at atmospheric pressure and the pressure at the measuring point. Replace "x psisg" with "Psg = x psi".

psig Psig (pound-force per square inch gauge) is a unit of pressure relative to atmospheric pressure at sea level. By contrast, psi measures pressure relative to a vacuum (such as that in space). Most pressure gauges, such as tire gauges, are calibrated to read zero at sea level, because most applications require the difference of pressure.

At sea level, Earth's atmosphere actually exerts a pressure of 14.695948804 psi (see below). Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.695948804 psi. Thus a reading of 30 psig on a tire gauge, represents an absolute pressure of 44.695948804 psi.

Psi is often used incorrectly instead of psig. TurnFast Glossary www.turnfast.com/refc_glossary/glossary.shtml, psi and psig

ksi and kip The ksi (Kip (unit), "kilo-pound per square inch") is 1000 psi, combining the prefix kilo with the psi abbreviation. It is occasionally used in materials science and mechanical engineering to specify stress (physics) and Young's modulus.

Magnitude

• Atmospheric pressure at sea level (standard): Pa = 14.695948804 psi
• Automobile tire overpressure (common): Pg = 32 psi
• Bike tire overpressure (common): Pg = 65 psi
• Air brake reservoir overpressure (common): 90 psi ≤ Pg ≤ 120 psi
• Ivan Drago's punch (fictional): Pg = 1850 psi
• Full Scuba set tank overpressure (common): Pg = 3,000 psi

Conversions Notes change from (atm. presure at sea level (1 Pa = 14.5 psi) to (1 bar = 14.5 psi)

See also

• Conversion of units#Pressure or mechanical stress
• Pressure#Units

External links

• Pressure measurement primer
• Online pressure conversions

reading in PSI (red scale) and kPa (black scale)The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/sq in) is a unit of pressure or of stress (physics) based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch:

1 lbf/sq in ≈ 6,894.757 pascal (unit) (the SI unit of pressure).

Relation to other measures Other abbreviations are used that append a modifier to "psi". However, the US National Institute of Standards and Technology recommends that, to avoid confusion, any modifiers be instead applied to the quantity being measured rather than the unit of measure For example, "Pg = 100 psi" rather than "P = 100 psig".

• psia (pounds-force per square inch absolute) - gauge pressure plus local atmospheric pressure. Replace "x psia" with "Pa = x psi".
• psid (psi difference) - difference between two pressures. Replace "x psid" with "ΔP = x psi".
• psig (pounds-force per square inch gauge). Replace "x psig" with "Pg = x psi".
• psivg (psi vented gauge) - difference between the measuring point and the local pressure. Replace "x psivg" with "Pvg = x psi".
• psisg (psi sealed gauge) - difference between a chamber of air sealed at atmospheric pressure and the pressure at the measuring point. Replace "x psisg" with "Psg = x psi".

psig Psig (pound-force per square inch gauge) is a unit of pressure relative to atmospheric pressure at sea level. By contrast, psi measures pressure relative to a vacuum (such as that in space). Most pressure gauges, such as tire gauges, are calibrated to read zero at sea level, because most applications require the difference of pressure.

At sea level, Earth's atmosphere actually exerts a pressure of 14.695948804 psi (see below). Humans do not feel this pressure because internal pressure of liquid in their bodies matches the external pressure. If a pressure gauge is calibrated to read zero in space, then at sea level on Earth it would read 14.695948804 psi. Thus a reading of 30 psig on a tire gauge, represents an absolute pressure of 44.695948804 psi.

Psi is often used incorrectly instead of psig. TurnFast Glossary www.turnfast.com/refc_glossary/glossary.shtml, psi and psig

ksi and kip The ksi (Kip (unit), "kilo-pound per square inch") is 1000 psi, combining the prefix kilo with the psi abbreviation. It is occasionally used in materials science and mechanical engineering to specify stress (physics) and Young's modulus.

Magnitude

• Atmospheric pressure at sea level (standard): Pa = 14.695948804 psi
• Automobile tire overpressure (common): Pg = 32 psi
• Bike tire overpressure (common): Pg = 65 psi
• Air brake reservoir overpressure (common): 90 psi ≤ Pg ≤ 120 psi
• Ivan Drago's punch (fictional): Pg = 1850 psi
• Full Scuba set tank overpressure (common): Pg = 3,000 psi

Conversions Notes change from (atm. presure at sea level (1 Pa = 14.5 psi) to (1 bar = 14.5 psi)

See also

• Conversion of units#Pressure or mechanical stress
• Pressure#Units

External links

• Pressure measurement primer
• Online pressure conversions

Pounds per square inch - Wikipedia, the free encyclopedia
The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lb f /in²) is a unit of pressure or of stress based on avoirdupois units.

pound per square foot - What does PSF stand for? Acronyms and ...
... Support Force: PSF: Pencak Silat of France: PSF: Peoples Students Federation (Pakistan) PSF: Per Square Foot ... PSF: pound per square foot ... pound per square foot Pound per square inch Pound pets

Pound-force per square inch – Wikipedia
Pounds-force per square inch oder auch nur pound per square inch („Pfund pro Quadratzoll“) ist eine angloameriakanische, in den USA gebräuchliche Maßeinheit des Drucks.

INEX: Wikipedia, the free encyclopedia (Pound-force per square inch)
Table of Contents. 1 Definition; 2 Explanation; 3 Context; 4 See also; 5 External links: The abbreviation psi has multiple meanings; see Psi for other possibilities.

Pound-Force/Square Inch Conversion
Pound-Force/Square Inch, unit of measure: The pound-force per square inch (symbol: lbf/in^2) is a non-SI unit of pressure based on avoirdupois units.

Inch Pound Trice Units
Psi, Y (poundax per square inch, la/ii, l/itt) (6895.3625 N/m/m) Charge: Que, q ... one inch from an identical charge in vacuo experiences a force of 600654080/4 pi pound inch per trice ...

poundal - definition of poundal by the Free Online Dictionary ...
A unit of force in the foot-pound-second system of measurement, equal to the ... Pound-force per square inch Pound-mass Pound-me-in-the-ass prison Pound-me-in-the-ass prison

Pound-breach - definition of Pound-breach by the Free Online ...
n. 1. The breaking of a public pound for releasing impounded animals.? ... Pound-force per square inch Pound-mass Pound-me-in-the-ass prison Pound-me-in-the-ass prison

Unit Conversion
... Force Pressure conversion: Enter the pressure to be converted; Choose units; Click convert

Pound-force per square inch - Memory Alpha, the Star Trek Wiki
A Pound-force per square inch (or psi) is the measurement unit of pressure. ... A Pound-force per square inch (or psi) is the measurement unit of pressure.