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B How does the universe expand with the law of thermodynamic

  1. Oct 13, 2016 #1
    If space is expanding wouldn't that violate the first law of thermodynamics
     
  2. jcsd
  3. Oct 13, 2016 #2

    phinds

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    Why do you think it would?
     
  4. Oct 13, 2016 #3

    Drakkith

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    The first law of thermodynamics has to do with conservation of energy. The problem is that defining the total energy of the universe is problematic and there's no one way to go about doing so if I remember correctly. I don't have much info on this topic, but I believe the answer is that conservation of energy doesn't apply when talking about the universe as a whole. Hopefully someone here can give you better info than I can.
     
  5. Oct 13, 2016 #4

    Drakkith

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    I'd think so if I'd never read up on the issue before.
     
  6. Oct 13, 2016 #5

    phinds

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    Yes, but I was trying to point him to conservation of energy on his own before spilling the beans the way you did :smile:
     
  7. Oct 13, 2016 #6
  8. Oct 13, 2016 #7

    Nugatory

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  9. Oct 13, 2016 #8

    russ_watters

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    I'm not so sure I would (I don't think I did the first time I heard about it). Why doesn't a baseball flying up violate the first law of thermodynamics?
     
  10. Oct 13, 2016 #9

    Drakkith

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    I've seen that very question asked here on PF before.
     
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