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Kirchhoff's law comparison table
Subject has definition
Kirchhoff's first lawTo each chemical species there corresponds a characteristic spectrum.
Kirchhoff's second lawEvery element is capable of absorbing the radiation which it is able to emit; this is the phenomenon of the reversal of the lines.

Next quantum lawRayleigh-Jeans law    Upquantum law    Previous quantum lawFermi-Dirac-Sommerfeld law