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.

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

SearchCompliance

  • PCI DSS (Payment Card Industry Data Security Standard)

    The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance framework

    A compliance framework is a structured set of guidelines that details an organization's processes for maintaining accordance with...

SearchSecurity

  • Trojan horse (computing)

    In computing, a Trojan horse is a program downloaded and installed on a computer that appears harmless, but is, in fact, ...

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • DNS over HTTPS (DoH)

    DNS over HTTPS (DoH) is a relatively new protocol that encrypts domain name system traffic by passing DNS queries through a ...

SearchHealthIT

  • telemedicine (telehealth)

    Telemedicine is the remote delivery of healthcare services, such as health assessments or consultations, over the ...

  • Project Nightingale

    Project Nightingale is a controversial partnership between Google and Ascension, the second largest health system in the United ...

  • medical practice management (MPM) software

    Medical practice management (MPM) software is a collection of computerized services used by healthcare professionals and ...

SearchDisasterRecovery

SearchStorage

  • M.2 SSD

    An M.2 SSD is a solid-state drive (SSD) that conforms to a computer industry specification and is used in internally mounted ...

  • kilobyte (KB or Kbyte)

    A kilobyte (KB or Kbyte) is a unit of measurement for computer memory or data storage used by mathematics and computer science ...

  • virtual memory

    Virtual memory is a memory management capability of an operating system (OS) that uses hardware and software to allow a computer ...

Close