Pounds per square inch: Difference between revisions
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<onlyinclude>'''Pounds per square inch''' or PSI is an [[imperial system of units|imperial unit]] of [[pressure]]. </onlyinclude> Using the imperial units of [[pound]]s and square inches, it is a measure of [[force]] per unit area. Since it is acting on a much smaller area than the [[pascal]], 1 PSI is much more pressure than | <onlyinclude>'''Pounds per square inch''' or PSI is an [[imperial system of units|imperial unit]] of [[pressure]]. </onlyinclude> Using the imperial units of [[pound]]s and square inches, it is a measure of [[force]] per unit area. Therefore, 1 PSI is measured as one [[pound]] of force applied per one square inch.<ref name = oxford>A. Atkins and M. Escudier, A dictionary of mechanical engineering. Oxford: Oxford University Press, 2013.</ref> Since it is acting on a much smaller area than the [[pascal]], 1 PSI is much more pressure than 1 pascal (metric unit). PSI is a non-[SI] unit, British unit that is now obsolete.<ref name = oxford /> | ||
PSI | Sometimes, PSI is specified on whether it is measuring [[gauge pressure|gauge]], [[absolute pressure|absolute]], or differential pressure.<ref>C. Schaschke, Dictionary of Chemical Engineering, A. Oxford University Press, USA, 2014.</ref> | ||
*'''Psia''': when pressure is measured with respect to [[vacuum]]. This is known as [[absolute pressure]]. | |||
*'''[[Psig]]''': when pressure is measured with respect to [[atmospheric pressure]]. This is known as [[gauge pressure]]. | |||
*'''Psid''': when the difference of pressure is measured between two points in the environment. This is known as differential pressure. | |||
PSI is often used for [[tire pressure]] and other situations where [[gauge pressure]] is being measured instead of [[absolute pressure]]. | |||
==Conversions== | ==Conversions== | ||
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==For Further Reading== | ==For Further Reading== | ||
*[[Psig]] | |||
*[[Pressure]] | *[[Pressure]] | ||
*[[Atmosphere]] | *[[Atmosphere]] | ||
*[[ | *[[PV diagram]] | ||
*[[Energy conversion technology]] | *[[Energy conversion technology]] | ||
*Or explore a [[Special:Random|random page]] | *Or explore a [[Special:Random|random page]] | ||
==Reference== | |||
{{reflist}} | |||
Revision as of 19:26, 31 January 2020
Pounds per square inch or PSI is an imperial unit of pressure. Using the imperial units of pounds and square inches, it is a measure of force per unit area. Therefore, 1 PSI is measured as one pound of force applied per one square inch.[1] Since it is acting on a much smaller area than the pascal, 1 PSI is much more pressure than 1 pascal (metric unit). PSI is a non-[SI] unit, British unit that is now obsolete.[1]
Sometimes, PSI is specified on whether it is measuring gauge, absolute, or differential pressure.[2]
- Psia: when pressure is measured with respect to vacuum. This is known as absolute pressure.
- Psig: when pressure is measured with respect to atmospheric pressure. This is known as gauge pressure.
- Psid: when the difference of pressure is measured between two points in the environment. This is known as differential pressure.
PSI is often used for tire pressure and other situations where gauge pressure is being measured instead of absolute pressure.
Conversions
For Further Reading
- Psig
- Pressure
- Atmosphere
- PV diagram
- Energy conversion technology
- Or explore a random page