High Quality Content by WIKIPEDIA articles! In thermodynamics,
Kirchhoff's law of thermal radiation, or Kirchhoff's law for short,
is a general statement equating emission and absorption in heated
objects, proposed by Gustav Kirchhoff in 1859, following from
general considerations of thermodynamic equilibrium and detailed
balance. An object at some non-zero temperature radiates
electromagnetic energy. If it is a perfect black body, absorbing
all light that strikes it, it radiates energy according to the
black-body radiation formula. More generally, it is a "grey body"
that radiates with some emissivity multiplied by the black-body
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