How is the consumption of free energy defined and measured in thermodynamics?

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SUMMARY

The consumption of free energy in thermodynamics is a well-defined concept that requires precise definitions of both a physical system and the term "consumption." The conversion of free energy into other forms, such as entropy, is measurable and established through techniques like differential scanning calorimetry. This method provides a quantitative approach to assess how much free energy a system has consumed during a process.

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Cybernetic1
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We know that free energy is a well-defined concept in thermodynamics. How about the *consumption* of free energy? Are there well-defined criteria for saying "system X has consumed E amounts of free energy" ?

That requires us to define what is a physical system, and secondly, to define consumption.

Thanks in advance!
 
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