Stefan constant

[Etymology: J. Stefan; Austria 1835-1893 (see Boltzmann constant)] mechanics The coefficient in the corresponding law that energy is proportional to the fourth power of the thermodynamic temperature, = 5.670 400(40)~ × 10^-8 W·m^-2·K^-4 with relative standard uncertainty 7.0 × 10^-6.
[Mohr P. J., Taylor B. N. CODATA Recommended Values of the Fundamental Physical Constants: 2002 (to be published)]
[Mohr P. J., Taylor B. N. Rev. Mod. Phys. Vol. 72:351-495 (2000)]
[Mohr P. Phys. Today Vol. 53:7, 11-16 (2000)]
[For latest recommended values, see http://physics.nist.gov/cuu/Constants/index.html]