What is negative heat capacity ?

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Discussion Overview

The discussion revolves around the concept of negative heat capacity, exploring its definition, implications, and examples. Participants examine theoretical scenarios and specific systems that may exhibit this property, including black holes and paramagnetic systems.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • Some participants express skepticism about the existence of negative heat capacity, arguing that it contradicts conservation of energy.
  • One participant defines negative heat capacity as a situation where adding energy to a system results in a decrease in temperature.
  • Another participant cites black holes as an example of a system with negative heat capacity.
  • Some participants suggest that certain paramagnetic systems may exhibit negative heat capacity at low temperatures.
  • It is proposed that any gravitationally bound system could have negative heat capacity, not limited to black holes.
  • A request for references regarding paramagnetic systems and negative heat capacity indicates a desire for further information and clarification on the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the existence or implications of negative heat capacity, with multiple competing views and examples presented.

Contextual Notes

There are unresolved questions regarding the definitions and conditions under which negative heat capacity may occur, as well as the specific examples provided by participants.

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what is" negative heat capacity"?

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


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.
 


i believe there are certain paramagnetic systems that have negative heat capacity (with constant pressure) at low temperatures.
 


Any gravitationally bound system will have negative heat capacity - it doesn't have to be a black hole.
 
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nealh149 said:
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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