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Pressure-Volume Work for Metastable Liquid and Solid at Zero Pressure.

Attila R Imre1,2, Krzysztof W Wojciechowski3,4, Gábor Györke2

  • 1Thermohydraulics Department, MTA Centre for Energy Research, P.O. Box 49, 1525 Budapest, Hungary.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces "aergiatic" processes, where systems change volume with zero work done at zero pressure. This concept parallels adiabatic processes but involves no work instead of no heat exchange.

Keywords:
adiabaticaergiaticheat exchangeisobaricmetastabilitymetastatenegative pressurespinodal

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Area of Science:

  • Thermodynamics
  • Physical Chemistry

Background:

  • Solids and liquids can exhibit negative, zero, or positive pressure, unlike gases.
  • Traditional thermodynamics defines work (p-V) based on pressure and volume changes.

Purpose of the Study:

  • To define and introduce a new thermodynamic process term for zero-work volume changes at zero pressure.
  • To establish a distinct terminology for thermodynamic processes involving work and heat exchange.

Main Methods:

  • Analysis of isobaric heat exchange at zero pressure (p=0).
  • Application of the traditional equality δW = dW to zero-pressure conditions.
  • Introduction of the term 'aergiatic' for processes with dW = 0.

Main Results:

  • Identified a special process at zero pressure where isobaric heating/cooling causes volume change without work.
  • Proposed the term 'aergiatic' for processes where no work is done (dW = 0).
  • Highlighted the phenomenological similarity between adiabatic (no heat exchange) and aergiatic (no work) processes.

Conclusions:

  • The concept of 'aergiatic' processes provides a distinct thermodynamic framework for zero-work volume changes.
  • This new terminology enhances the classification of thermodynamic processes, complementing the concept of adiabatic processes.