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What is negative heat capacity ?

  1. May 2, 2009 #1
    what is" negative heat capacity"?

    what is "negative heat capacity"? what is the example of it?
     
  2. jcsd
  3. May 2, 2009 #2

    Matterwave

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    Re: what is" negative heat capacity"?

    I can't imagine there would be such a case! For a negative heat capacity would imply that as you put more energy into a system, the system gets colder. Or as you take energy away from a system the system gets hotter. Both of these scenarios violate conservation of energy. AFAIK.

    But, I haven't studied all of physics, so correct me if I'm wrong...
     
  4. May 2, 2009 #3

    nicksauce

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    Re: what is" negative heat capacity"?

    1) Negative heat capacity is simply when as you put energy into a system, its temperature decreases
    2) One example is a black hole... I cannot think of any others.
     
  5. May 3, 2009 #4
    Re: what is" negative heat capacity"?

    i believe there are certain paramagnetic systems that have negative heat capacity (with constant pressure) at low temperatures.
     
  6. May 3, 2009 #5

    Vanadium 50

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    Re: what is" negative heat capacity"?

    Any gravitationally bound system will have negative heat capacity - it doesn't have to be a black hole.
     
  7. May 4, 2009 #6

    Mapes

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    Re: what is" negative heat capacity"?

    Can you give a reference for this? I thought gravitationally bound systems were the only example, and would like to learn more.
     
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