Browse Definitions:
Definition

pounds per square inch (PSI)

Contributor(s): Matthew Haughn

Pounds per square inch (PSI) is a measurement of pressure in the Imperial system of measurement.

PSI is commonly used to measure the pressure of gasses (pneumatic pressure) or liquids (hydraulic pressure). PSI is also used as a measure of tensile strength, defined as resistance to pulling forces, and elastic modulus strength, defined as resistance to deformation, which controls the stiffness of materials.

In pneumatic and hydraulic pressure, PSI expresses the force exerted on its containing vessel by the two relative fluids. In fluid pressure measurement, the use of PSI is generally relative to atmosphere. This is because PSI as measured by PSI gauge (PSIG) is inherently measured as a differential balance against atmospheric pressure, generally being immersed in it. PSI measurement may also be absolute: relative to a vacuum or PSI absolute (PSIA).

PSI is used to measure tensile strength in materials where thousands of PSI (Kpsi) are common and to measure elastic modulus of materials where millions of PSI (Mpsi) are common. Gauges measuring pressure are used in all manner of instrumentation for vehicles, pneumatic and hydraulic machines, as well as industrial and safety systems. In compressed air power, a PSI gauge is the equivalent to a fuel gauge.

Equivalent terms in other measurement systems are:

  • Metrics pascal (Pa) = 6.8948 xPSI.
  • Multiples of atmospheric pressure (ATM) = 6.8046 xPSI.
  • Technical atmospheres: 1 kilogram of force per centimeter squared (AT) = 7.03069 x PSI.
  • Torr, the measurement used by the inventor of the barometer = 51.71493 PSI.
  • Bar, a rounding off of atmosphere based on 100 000 Pa = 6.8948 x PSI.

Real Tool Reviews on static versus working PSI:

This was last updated in January 2017

Continue Reading About pounds per square inch (PSI)

Join the conversation

1 comment

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

How do you calculate pounds per inch (PSI) in the data center?
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

  • pure risk (absolute risk)

    Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

  • risk assessment

    Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.

SearchSecurity

  • principle of least privilege (POLP)

    The principle of least privilege (POLP), an important concept in computer security, is the practice of limiting access rights for...

  • identity management (ID management)

    Identity management (ID management) is the organizational process for identifying, authenticating and authorizing individuals or ...

  • zero-day (computer)

    A zero-day vulnerability, also known as a computer zero day, is a flaw in software, hardware or firmware that is unknown to the ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • call tree

    A call tree -- sometimes referred to as a phone tree -- is a telecommunications chain for notifying specific individuals of an ...

SearchStorage

  • SAS SSD (Serial-Attached SCSI solid-state drive)

    A SAS SSD (Serial-Attached SCSI solid-state drive) is a NAND flash-based storage or caching device designed to fit in the same ...

  • MTTR (mean time to repair)

    MTTR (mean time to repair) is the average time required to fix a failed component or device and return it to production status.

  • OpenStack Swift

    OpenStack Swift, also known as OpenStack Object Storage, is an open source object storage system that is licensed under the ...

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close