Browse Definitions :
Definition

pressure

Pressure is an expression of force exerted on a surface per unit area. The standard unit of pressure is the pascal (Pa), equivalent to one newton per meter squared (N/m 2 or N · m -2). Alternatively, pressure can be measured in dynes per centimeter squared (dyn/cm 2 or dyn · cm -2). To convert from pascals to dynes per centimeter squared, multiply by 10. Conversely, multiply by 0.1.

Consider an enclosed chamber filled with a gas and surrounded by a vacuum. The pressure exerted on the walls of the chamber by the gas depends on three factors: (1) the amount of gas in the chamber, (2) the temperature of the gas, and (3) the volume of the chamber. As the amount of gas increases, assuming the volume of the chamber and the temperature remain constant, the pressure increases. As the temperature increases, assuming the amount of gas and the size of the chamber remain constant, the pressure increases. As the volume of the chamber increases, assuming the amount of gas in the chamber and the temperature remain constant, the pressure decreases. These are idealized examples; in practical scenarios these three factors often interact.

The pressure of the Earth's atmosphere at sea level is approximately 10 5 Pa. A unit of 100 Pa is known as a millibar (mb); atmospheric pressure is generally about 1,000 mb at sea level.

Also see newton, pascal, SI (International System of Units), and Table of Physical Units.

This was last updated in December 2016

Continue Reading About pressure

Join the conversation

3 comments

Send me notifications when other members comment.

Please create a username to comment.

I UNDERSTAND EVERYTHING ABOUT PRESSURE
Cancel
can you tell me how pressure works
Cancel
P=F/A. Use this equation and will get to know that how its work physically.
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