Stefan-Boltzmann constant: Difference between revisions
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<onlyinclude>The '''Stefan-Boltzmann constant''' is a constant of proportionality, σ = < | <onlyinclude>The '''Stefan-Boltzmann constant''' is a constant of proportionality, σ = <math> 5.67 \times 10^{-8} \frac{W}{m^2K^4}</math> which gives how much [[power]] is radiated by an object at a given [[temperature]].</onlyinclude><ref>Kenneth Krane. ''Modern Physics'', 3rd ed. Hoboken, NJ, USA: John Wiley & Sons, 2012.</ref> It is a physical constant involved in the calculations regarding [[blackbody radiation]] in the [[Stefan-Boltzmann law]]. The constant defines the [[power]] per unit area emitted by a blackbody as a function of its [[temperature]].<ref>Marc L. Kutner. Astronomy: A Physical Perspective, 2nd ed. New York, USA: Cambridge University Press, 2003</ref> | ||
This constant was first calculated in 1879 by physicist Josef Stefan, and later again in 1884 by physicist Ludwig Boltzmann who took a more thermodynamic approach.<ref>Encyclopedia Brittanica. (2015, Mar.7). ''Stefan-Boltzmann Law'' [Online]. Available: http://www.britannica.com/EBchecked/topic/564843/Stefan-Boltzmann-law</ref> The Stefan-Boltzmann constant isn't a fundamental constant but is actually made of other constants (see the derivation from the [[Plank radiation formula]] on [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan2.html#c1 hyperphysics]), which are used together often enough to be treated as a single constant. | This constant was first calculated in 1879 by physicist Josef Stefan, and later again in 1884 by physicist Ludwig Boltzmann who took a more thermodynamic approach.<ref>Encyclopedia Brittanica. (2015, Mar.7). ''Stefan-Boltzmann Law'' [Online]. Available: http://www.britannica.com/EBchecked/topic/564843/Stefan-Boltzmann-law</ref> The Stefan-Boltzmann constant isn't a fundamental constant but is actually made of other constants (see the derivation from the [[Plank radiation formula]] on [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan2.html#c1 hyperphysics]), which are used together often enough to be treated as a single constant. | ||
Revision as of 22:26, 11 May 2018
The Stefan-Boltzmann constant is a constant of proportionality, σ = which gives how much power is radiated by an object at a given temperature.[1] It is a physical constant involved in the calculations regarding blackbody radiation in the Stefan-Boltzmann law. The constant defines the power per unit area emitted by a blackbody as a function of its temperature.[2]
This constant was first calculated in 1879 by physicist Josef Stefan, and later again in 1884 by physicist Ludwig Boltzmann who took a more thermodynamic approach.[3] The Stefan-Boltzmann constant isn't a fundamental constant but is actually made of other constants (see the derivation from the Plank radiation formula on hyperphysics), which are used together often enough to be treated as a single constant.
References
- ↑ Kenneth Krane. Modern Physics, 3rd ed. Hoboken, NJ, USA: John Wiley & Sons, 2012.
- ↑ Marc L. Kutner. Astronomy: A Physical Perspective, 2nd ed. New York, USA: Cambridge University Press, 2003
- ↑ Encyclopedia Brittanica. (2015, Mar.7). Stefan-Boltzmann Law [Online]. Available: http://www.britannica.com/EBchecked/topic/564843/Stefan-Boltzmann-law