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Black Body radiation and thermal equilibrium

  1. Jan 18, 2016 #1
    Wikipedia writes: "Black-body radiation is the type of electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment". Why does it write "thermodynamic equilibrium"? If it is not in a thermodynamic equilibrium, then what changes as far as the absorption and emmition of light go?
     
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  3. Jan 18, 2016 #2

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    Net absorbtion/emission.
     
  4. Jan 19, 2016 #3
    In what way does it change?
     
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