Stefan-Boltzmann constant [′shte‚fän ′bōlts‚män ‚kän·stənt] (statistical mechanics) The energy radiated by a blackbody per unit area per unit time divided by the fourth power of the body's temperature; equal to (5.6696 ± 0.0010) × 10-8(watt)(meter)-2(kelvin)-4....
Boltzmannfrom thermodynamic considerations: ifEis the radiant heatenergyemitted from a unit area in one second (that is, the power from a unit area) andTis theabsolute temperature(inkelvins), thenE= σT4, the Greek letter sigma (σ) representing the constant of proportionality, called the ...
The , also known as , states that the total radiated per unit surface of a per unit (also known as the black-body or ), , is directly to the fourth power of the black body's (also called ):The constant of proportionality σ, called the Stefan–Boltzmann constant or , derives from ...