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B Entropy and Hawking radiation

  1. Apr 12, 2016 #1
    Dear PF Forum,
    I'm trying to make sense about Hawking radiation in Black Hole. And that leads me into entropy.
    I read this equation in
    What does that mean?
    S is the change of Entropy
    What does Qrev mean there?
    Is it in Calorie? then Joule?
    T, I think is in Kelvin.
  2. jcsd
  3. Apr 13, 2016 #2


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    Gold Member

    Q_rev is the heating change for a reversible process. Googling "units of entropy" returns J/K, so I'm gonna say it's in Joules. T, being the absolute temperature, has to be in kelvin.
  4. Apr 13, 2016 #3
    Joule per temperature, ...? Ok, I'll try to imagine it. Thanks.
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