Stefan–Boltzmann constant
- Stefan–Boltzmann constant
The Stefan–Boltzmann constant (also Stefan's constant), a physical constant denoted by the Greek letter σ, is the constant of proportionality in the Stefan–Boltzmann law: the total energy radiated per unit surface area of a black body in unit time is proportional to the fourth power of the thermodynamic temperature.
The value of σ is 5.670400e|−8 W·m-2·K-4. This value is derivable as well as experimentally determinable; see Stefan–Boltzmann law.
σ can be defined in terms of the Boltzmann constant as:
:
where "h" is Planck's constant, is Dirac's form of Planck's constant, and "c" is the speed of light in a vacuum.
A related constant is the radiation constant ( [http://scienceworld.wolfram.com/physics/RadiationConstant.html] ) which is equal to
:.
External links
* [http://physics.nist.gov/cgi-bin/cuu/Value?eqsigma Stefan–Boltzmann constant] , value from CODATA.
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constante de Stefan-Boltzmann — Stefano ir Bolcmano konstanta statusas T sritis fizika atitikmenys: angl. Stefan Boltzmann constant vok. Stefan Bolzmannsche Konstante, f; Strahlungskonstante, f rus. постоянная Стефана Больцмана, f pranc. constante de Stefan Boltzmann, f … Fizikos terminų žodynas
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