Why does the temperature is invariant on phase transitions?

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Discussion Overview

The discussion revolves around the concept of temperature invariance during phase transitions, exploring the relationship between energy, temperature, and molecular interactions. Participants examine the underlying principles of thermodynamics and statistical mechanics in this context.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses confusion about why energy input during phase transitions primarily affects potential energy rather than kinetic energy, questioning the intuitive understanding of this process.
  • Another participant clarifies that temperature is not equivalent to kinetic energy and emphasizes that temperature is a statistical measure related to the multiplicity of microstates in a system.
  • A different perspective is introduced, suggesting the possibility of a phase transition where another quantity remains unchanged while temperature decreases, prompting further inquiry.
  • There is a question raised about the occurrence of phase transitions during adiabatic processes, indicating a potential area of exploration regarding energy transfer and state changes.

Areas of Agreement / Disagreement

Participants present multiple viewpoints and questions regarding the relationship between temperature and phase transitions, indicating that the discussion remains unresolved with competing ideas and interpretations.

Contextual Notes

Some assumptions about the nature of temperature and energy distribution during phase transitions are not fully explored, and the implications of adiabatic processes on phase transitions remain unclear.

FG_313
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Hello there, this is a fact that I can't understand thinking about it... Energy has to be given so that the inter molecular bonds can be broken, and energy goes in when there are formed (even though that sounds very counter intuitive to me), but why is the energy all distributed to potential energy (bonds) and it stops going to kinetic energy in the process?
 
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Temperature is not kinetic energy! This is only true for an ideal gas.

Temperature is based on statistics. Two systems have the same temperature when the combined system is in its most probable state. This means that the subsystems have the same relative change in their multiplicity (numbers of microstates) with a small exchange of energy.
 
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Maybe another perspective to look into the question is: is it valid to ask, does there exist a phase transition where some other quantity remains unchanged while temperature suddenly drops say?
 
In an adiabatic process, this might happen ...? But for an adiabatic process, can there be a phase transition?
 

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