Some Uncommon Thermodynamic Potentials and the “Thermodynamic Equations of State”

1971 ◽  
Vol 39 (11) ◽  
pp. 1295-1299
Author(s):  
Roger P. Gordon
Keyword(s):  
Equations Of State ◽  
Thermodynamic Potentials ◽  
Thermodynamic Equations

A Mnemonic Scheme for Thermodynamics

MRS Bulletin ◽  
2009 ◽  
Vol 34 (2) ◽  
pp. 92-94 ◽  
Author(s):  
J.-C. Zhao
Keyword(s):  
Free Energy ◽  
Internal Energy ◽  
Gibbs Free Energy ◽  
Maxwell Equations ◽  
Helmholtz Free Energy ◽  
State Variables ◽  
Max Born ◽  
Thermodynamic Potentials ◽  
Classical Thermodynamics ◽  
Thermodynamic Equations

AbstractA mnemonic scheme is presented to help recall the equations in classical thermodynamics that connect the four state variables (temperature, pressure, volume, and entropy) to the four thermodynamic potentials (internal energy, Helmholtz free energy, enthalpy, and Gibbs free energy). Max Born created a square to help recall the thermodynamic equations. The new scheme here separates the Max Born square into two squares, resulting in easier recalling of several sets of equations, including the Maxwell equations, without complicated rules to remember the positive or negative signs.

Thermodynamic Derivations of Various Ammonium Salt Deposition Equations Common to the Refining Industry

CORROSION ◽  
10.5006/2855 ◽  
2018 ◽  
Vol 74 (10) ◽  
pp. 1158-1163 ◽  
Author(s):  
Brian R. Munson ◽  
Michael S. Cayard
Keyword(s):  
Ammonium Salt ◽  
Heat Exchangers ◽  
Equations Of State ◽  
Chemical Species ◽  
Refining Industry ◽  
Ammonium Salts ◽  
The Public ◽  
Salt Deposition ◽  
The Individual ◽  
Thermodynamic Equations

Ammonium salts represent a common problem for the refining industry. These saltslead to fouling of piping and heat exchangers resulting in loss of duty, underdeposit corrosionwhen wetted, and corrosive sour water solutionsonce sufficient water is available to dissociate these salts into solution. To properly manage fouling and corrosion associated with these salts, knowledge of the temperatures at which these salts will deposit is critical. In this age of process control, these temperatures can be predicted in real-time provided the salt deposition temperature relationships are known. The salt deposition equations for salts most often encountered in refining are not in the public domain. To close this gap, ammonium salt deposition equations were derived for NH4Cl, NH4HS, NH4Br, and NH4Fusing fundamental thermodynamic equations of state with published thermodynamic properties for the individual chemical species/reactions.

scholarly journals Fishing with Scissors: A Mnemonic for Thermodynamic Formula

2021 ◽  
Vol 37 (3) ◽  
pp. 700-703
Author(s):  
Gami Girishkumar Bhagavanbhai ◽  
Juan J. Bravo-Suárez ◽  
Rawesh Kumar
Keyword(s):  
Free Energy ◽  
Thermodynamic Potential ◽  
Helmholtz Free Energy ◽  
Large Range ◽  
State Variables ◽  
Quick Method ◽  
Practical Applications ◽  
Simple Set ◽  
Thermodynamic Potentials ◽  
Thermodynamic Equations

Most of the branches of engineering and basic science require,to a different extent,the use of basic thermodynamic formulas relating state variables (temperature, T; pressure, P; volume, V; entropy, S) and thermodynamic potentials (internal energy, U; Helmholtz free energy, A; enthalpy, H; Gibbs free energy, G). The different interrelations among variables, their constrains, and dependencies make them particularly difficult to remember and understand. For students learning and for chemists and engineers needing to rapidly recall these thermodynamic relationships for problem solving and practical applications, a quick method to easily remember them would be most welcome. Herein, Fishing with scissors mnemonic is presented. The mnemonic is seen as Sun with rays. Thermodynamic potential terms (A, G, H, U) as alphabetic doubles are aligned in sun rays regions where as state variables (T, P, S, V) are at sun body. Following a simple set of rules in this mnemonic, a large range of thermodynamic equations can be easily recalled without direction or sign difficulties present in previously reported methods.

Thermodynamic equations of state for hydrazine and monomethylhydrazine

2002 ◽  
Vol 131 (3) ◽  
pp. 316-328 ◽  
Author(s):  
Michelle Barragan ◽  
Stephen Woods ◽  
Howard L. Julien ◽  
D.B. Wilson ◽  
Regor Saulsberry
Keyword(s):  
Equations Of State ◽  
Thermodynamic Equations
Sign in / Sign up

Export Citation Format

Share Document