Can an object gain heat without expanding?

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Discussion Overview

The discussion centers around the question of whether an object can gain heat without expanding, exploring concepts related to heat transfer, pressure, and the behavior of gases under constraints. The scope includes theoretical considerations and conceptual clarifications.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants question the premise of whether an object can gain heat without expanding, suggesting a need for clarification on terminology.
  • One participant proposes that applying pressure to a fixed volume of gas would result in an increase in temperature, implying a relationship between pressure and heat.
  • Another participant discusses the idea of heat-expansion, suggesting that even if an object is not allowed to expand, it can still increase in temperature, equating this to heating and then compressing the object back to its original size.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between heat gain and expansion, with no consensus reached on the core question.

Contextual Notes

There are unresolved assumptions regarding the definitions of heat gain and the conditions under which temperature changes occur, particularly in relation to compressibility and fixed volumes.

AgentPancake
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why?
 
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AgentPancake said:
why?
Why do you think they shouldn't.

P.S. Take a look at this FAQ for a clarification of terminology and why it is wrong to say something "gains heat": https://www.physicsforums.com/showthread.php?t=511174
 
Last edited by a moderator:
Welcome to PF!

Hi AgentPancake! Welcome to PF! :smile:

If you put pressure on a fixed volume of gas, won't it heat up? :wink:
 
I think he's talking about heat-expansion and how a body that's not allowed to expand still get hotter.

The trick here is that all objects are at least somewhat compressible. Increasing temperature without allowing to expand is equivalent to heating the object up and then compressing it to original size. (In terms of forces involved.)
 

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