Definition

Stefan-Boltzmann constant

Part of the IT standards and organizations glossary:

The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma ( ), is a physical constant involving black body radiation. A black body, also called an ideal radiator, is an object that radiates or absorbs energy with perfect efficiency at all electromagnetic wavelength s. The constant defines the power per unit area emitted by a black body as a function of its thermodynamic temperature .

According to a principle of physics called Stefan's law , the relationship between emitted power per unit area (in watt s per square meter, denoted M ) and thermodynamic temperature (in kelvin s, denoted T) is:

M = T 4

That is, the power per unit area is directly proportional to the fourth power of the thermodynamic temperature.

The value of the Stefan-Boltzmann constant is approximately 5.67 x 10 -8 watt per meter squared per kelvin to the fourth (W · m -2 · K -4 ).

Also see Table of Physical Constants .

This was last updated in September 2005
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 Stefan-Boltzmann constantPowered 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.