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Thermodynamic Property Relations

Thermodynamic Property Relations. Chapter 12. The Maxwell Relations. The equation that relate the partial derivatives of properties P, v , T and s of a simple compressible system to each other are called the Maxwell relations. They are obtained from the four Gibb equation, expressed as:.

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Thermodynamic Property Relations

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  1. Thermodynamic Property Relations Chapter 12

  2. The Maxwell Relations • The equation that relate the partial derivatives of properties P, v, T and s of a simple compressible system to each other are called the Maxwell relations. • They are obtained from the four Gibb equation, expressed as:

  3. The Maxwell Relations are

  4. The Clapeyron Equation • This equation enables us to determine the enthalpy change associated with a phase change from a knowledge of P, v and T data alone.

  5. The Clapeyron – Clausius Equation • For liquid – vapor and solid – vapor phase change processes at low pressures, it can be approximated as

  6. General Relations • Internal Energy Changes

  7. Enthalpy Changes

  8. Entropy Changes

  9. Specific Heats Cv and CP

  10. Volume Expansivity (β) & Isothermal Compressibility (α)

  11. The Joule – Thomson Coefficient • It is a measure of the change in temperature of a substance with pressure during a constant enthalpy process, and it can be expressed as

  12. The enthalpy departure can be expressed as:

  13. Similarly

  14. EXAMPLE

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