Definition

standard temperature and pressure (STP)

Part of the IT standards and organizations glossary:

Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level. This value is important to physicists, chemists, engineers, and pilots and navigators.

Standard temperature is defined as zero degrees Celsius (0 0C), which translates to 32 degrees Fahrenheit (32 0F) or 273.15 degrees kelvin (273.15 0K). This is essentially the freezing point of pure water at sea level, in air at standard pressure.

Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg). This is about 29.9 inches of mercury, and represents approximately 14.7 pounds per inch (14.7 lb/in2). Imagine a column of air measuring one inch square, extending straight up into space beyond the atmosphere. The air in such a column would weigh about 14.7 pounds.

The density of air at STP is approximately 1.29 kilogram per meter cubed (1.29 kg/m3). This fact comes as a surprise to many people; a cubic meter of air weighs nearly three pounds!

Also see kilogram, meter, kilogram per meter cubed, SI (International System of Units), and specific gravity.

This was last updated in June 2008
Posted by: Margaret Rouse

Related Terms

Definitions

  • Microsoft Most Valuable Professional (MVP)

    - A Microsoft Most Valuable Professional (MVP) is an individual recognized by Microsoft for exceptional technical expertise and a talent for sharing knowledge within their technical community. (SearchWindowsServer.com)

  • standard

    - A standard is a generally agreed-upon technology, method or format for a given application. Official standards are overseen by one of a number of governing bodies that exist to promote their develo... (WhatIs.com)

  • standards organization

    - A standards organization, sometimes referred to as a standards body, is an organization with authority to endorse official standards for given applications. (WhatIs.com)

Glossaries

  • IT standards and organizations

    - Terms related to information technology (IT) standards, including definitions about IT organizations and words and phrases about policies and compliance.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About standard temperature and pressure (STP)Powered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.