Stefan's law

  1. Hello i am a new member of this forum. I am a student of class 11th. I came across a new law , 'Stefan's law', in my class. I did not understand it much. Could any of you help me to understand it please?
     
  2. jcsd
  3. Kurdt

    Kurdt 4,941
    Staff Emeritus
    Science Advisor
    Gold Member

  4. What if it is surrounded by something of a temperature higher than itself? Would it still radiate energy? Won't that be against thermodynamic laws?
     
  5. rock.freak667

    rock.freak667 6,231
    Homework Helper

    It would still radiate heat, it is just that it would have a net heat gain.
     
  6. Why does on Stefan's law only the emissivity of the object is used- why the emissivity of the surrounding is not taken into account?
     
    Last edited: Apr 2, 2011
  7. rock.freak667

    rock.freak667 6,231
    Homework Helper

    Because the object is radiating heat to the surroundings. So if the object it white, it will radiate less heat than if it were black.

    How much radiation reaches another object depends on something called "view factor".
     
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