What is negative heat capacity ?

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what is" negative heat capacity"?

what is "negative heat capacity"? what is the example of it?
 

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Matterwave
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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...
 
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nicksauce
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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.
 
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i believe there are certain paramagnetic systems that have negative heat capacity (with constant pressure) at low temperatures.
 
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Vanadium 50
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Any gravitationally bound system will have negative heat capacity - it doesn't have to be a black hole.
 
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Mapes
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i believe there are certain paramagnetic systems that have negative heat capacity (with constant pressure) at low temperatures.

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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