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Modified Thermodynamic Square with Physical Considerations
New Phys.: Sae Mulli 2019; 69: 1252~1256
Published online December 31, 2019;
© 2019 New Physics: Sae Mulli.

Suk Joo YOUN*

Department Physics Education, Gyeongsang National University, Jinju 52828, Korea
Correspondence to:
Received August 27, 2019; Revised October 15, 2019; Accepted October 15, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Modified thermodynamic square is suggested with some physical considerations. The Legendre transformed relations of the internal energy $E$, the Helmholtz free energy $F$, the Gibbs free energy $G$, and the enthalpy $H$ can be represented at the vertices on a diamond diagram, with these vertices being located at the center of the edges of the thermodynamic square. Finally, the complete thermodynamic square can be obtained by marking the state variables at the vertices of the square.The internal energy and the Helmholtz free energy are represented by $E$ and $F$ for mnemonic convenience. Knowing the conjugate relations between the state variables and differentiating between the extensive and the intensive variables can help in remembering and utilizing the diagram.
PACS numbers: 01.40.$-$d, 05.70.Ce
Keywords: Physics education, Thermodynamics, Thermodynamic square, Born square, Diagram

January 2020, 70 (1)
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