List of thermodynamic properties

Short description: None

In thermodynamics, a physical property is any property that is measurable, and whose value describes a state of a physical system. Thermodynamic properties are defined as characteristic features of a system, capable of specifying the system's state. Some constants, such as the ideal gas constant, R, do not describe the state of a system, and so are not properties. On the other hand, some constants, such as Kf (the freezing point depression constant, or cryoscopic constant), depend on the identity of a substance, and so may be considered to describe the state of a system, and therefore may be considered physical properties.

"Specific" properties are expressed on a per mass basis. If the units were changed from per mass to, for example, per mole, the property would remain as it was (i.e., intensive or extensive).

## Regarding work and heat

Work and heat are not thermodynamic properties, but rather process quantities: flows of energy across a system boundary. Systems do not contain work, but can perform work, and likewise, in formal thermodynamics, systems do not contain heat, but can transfer heat. Informally, however, a difference in the energy of a system that occurs solely because of a difference in its temperature is commonly called heat, and the energy that flows across a boundary as a result of a temperature difference is "heat".

Altitude (or elevation) is usually not a thermodynamic property. Altitude can help specify the location of a system, but that does not describe the state of the system. An exception would be if the effect of gravity need to be considered in order to describe a state, in which case altitude could indeed be a thermodynamic property.

Thermodynamic properties and their characteristics  Property | Symbol | Units | Extensive? | Intensive? | Conjugate | Potential?

|
|
|
|
|
|

Activity  | a |  - |  | Y |  |
Chemical potential | μi | kJ/mol  |  | Y | Particle
number Ni |
Compressibility (adiabatic) | βS, κ | Pa−1 |  | Y |  |
Compressibility (isothermal) | βT, κ | Pa−1 |  | Y |  |
Cryoscopic constant[1] | Kf | K·kg/mol  |  | Y |  |
Density | ρ | kg/m3 |  | Y |  |
Ebullioscopic constant | Kb | K·kg/mol  |  | Y |  |
Enthalpy | H | J  | Y |  |  | Y
Specific enthalpy  | h | J/kg  |  | Y |  |
Entropy | S | J/K  | Y |  | Temperature T | Y (entropic)
Specific entropy  | s | J/(kg K)  |  | Y |  |
Fugacity | f | N/m2 |  | Y |  |
Gibbs free energy | G | J  | Y |  |  | Y
Specific Gibbs free energy  | g | J/kg  |  | Y |  |
Gibbs free entropy | Ξ | J/K  | Y |  |  | Y (entropic)
Grand / Landau potential | Ω | J  | Y |  |  | Y
Heat capacity (constant pressure) | Cp | J/K  | Y |  |  |
Specific heat capacity
(constant pressure) | cp | J/(kg·K)  |  | Y |  |
Heat capacity (constant volume) | Cv | J/K  | Y |  |  |
Specific heat capacity
(constant volume) | cv | J/(kg·K)  |  | Y |  |
Helmholtz free energy | A, F | J  | Y |  |  | Y
Helmholtz free entropy | Φ | J/K  | Y |  |  | Y (entropic)
Internal energy | U | J  | Y |  |  | Y
Specific internal energy  | u | J/kg  |  | Y |  |
Internal pressure | πT | Pa  |  | Y |  |
Mass | m | kg  | Y |  |  |
Particle number | Ni |  - | Y |  | Chemical
potential μi |
Pressure | p | Pa  |  | Y | Volume V |
Temperature | T | K  |  | Y | Entropy S |
Thermal conductivity | k | W/(m·K)  |  | Y |  |
Thermal diffusivity | α | m2/s  |  | Y |  |
Thermal expansion (linear) | αL | K−1 |  | Y |  |
Thermal expansion (area) | αA | K−1 |  | Y |  |
Thermal expansion (volumetric) | αV | K−1 |  | Y |  |
Vapor quality[2] | χ |  - |  | Y |  |
Volume | V | m3 | Y |  | Pressure P |
Specific volume | ν | m3/kg  |  | Y |  |

## See also

* Conjugate variables
* Dimensionless numbers
* Intensive and extensive properties
* Thermodynamic databases for pure substances
* Thermodynamic variable

## References

1. ↑ Aylward, Gordon; Findlay, Tristan (2002), SI Chemical Data 5th ed. (5 ed.), Sweden: John Wiley & Sons, pp. 202, ISBN 0-470-80044-5
2. ↑ Cengel, Yunus A.; Boles, Michael A. (2002). Thermodynamics: an engineering approach. Boston: McGraw-Hill. pp. 79. ISBN 0-07-121688-X.

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/List of thermodynamic properties. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Physics:List_of_thermodynamic_properties&oldid=611037"