This Demonstration plots the radiated heat in
from a hot body having a given emissivity,
, as a function of its temperature and that of its surroundings, both entered either in °C or °K. This heat output is calculated with the Stefan-Boltzmann law,
is the emissivity,
is the Stefan-Boltzmann constant,
is the area in
(equal to 1 in this Demonstration),
is the radiating body temperature, and
is the ambient temperature, both in °K. The upper graphic is a schematic visual representation of the selected emissivity (not to scale).
Reference: C. J. Geankoplis, Transport Processes and Unit Operations,
ed., Boston: Allyn and Bacon, 1983.