Virial equation of state: Difference between revisions

From SklogWiki
Jump to navigation Jump to search
m (Slight tidy.)
m (→‎References: Added a recent publication)
(8 intermediate revisions by the same user not shown)
Line 1: Line 1:
The '''virial equation of state''' is used to describe the behavior of diluted gases.  
The '''virial equation of state''' is used to describe the behavior of diluted gases.  
It is usually written as an expansion of the [[compressibility factor]], <math> Z </math>, in terms of either the
It is usually written as an expansion of the [[compressibility factor]], <math> Z </math>, in terms of either the
density or the pressure. Such an expansion was first introduced by Heike Kamerlingh Onnes in 1901 (Ref. 1 and 2). In the first case:
density or the pressure. Such an expansion was first introduced in 1885 by Thiesen <ref>[http://dx.doi.org/10.1002/andp.18852600308 M. Thiesen "Untersuchungen über die Zustandsgleichung", Annalen der Physik '''24''' pp. 467-492 (1885)]</ref> and extensively studied by Heike Kamerlingh Onnes <ref> H. Kammerlingh Onnes "Expression of the equation of state of gases and liquids by means of series", Communications from the Physical Laboratory of the University of Leiden '''71''' pp. 3-25 (1901)</ref>
<ref>[http://www.digitallibrary.nl/proceedings/search/detail.cfm?pubid=436&view=image&startrow=1 H. Kammerlingh Onnes "Expression of the equation of state of gases and liquids by means of series", Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen '''4''' pp. 125-147 (1902)]</ref>, and mathematically by Ursell <ref>[http://dx.doi.org/10.1017/S0305004100011191 H. D. Ursell "The evaluation of Gibbs' phase-integral for imperfect gases", Mathematical Proceedings of the Cambridge Philosophical Society '''23''' pp. 685-697 (1927)]</ref>. One has
   
   
:<math> \frac{p V}{N k_B T } = Z = 1 + \sum_{k=2}^{\infty} B_k(T) \rho^{k-1}</math>.
:<math> \frac{p V}{N k_B T } = Z = 1 + \sum_{k=2}^{\infty} B_k(T) \rho^{k-1}</math>.
Line 15: Line 16:
*<math> B_k\left( T \right) </math> is called the k-th virial coefficient
*<math> B_k\left( T \right) </math> is called the k-th virial coefficient
==Virial coefficients==
==Virial coefficients==
The [[second virial coefficient]] represents the initial departure from ideal-gas behavior
The [[second virial coefficient]] represents the initial departure from [[Ideal gas |ideal-gas]] behaviour


:<math>B_{2}(T)= \frac{N_A}{2V} \int .... \int (1-e^{-\Phi/k_BT}) ~d\tau_1 d\tau_2</math>
:<math>B_{2}(T)= \frac{N_A}{2V} \int .... \int (1-e^{-\Phi/k_BT}) ~d\tau_1 d\tau_2</math>
Line 27: Line 28:


where ''f'' is the [[Mayer f-function]] (see also: [[Cluster integrals]]).
where ''f'' is the [[Mayer f-function]] (see also: [[Cluster integrals]]).
See also:
See also <ref>[http://dx.doi.org/10.1080/002689796173453 M. S. Wertheim "Fluids of hard convex molecules III. The third virial coefficient", Molecular Physics '''89''' pp. 1005-1017 (1996)]</ref>
*[http://dx.doi.org/10.1080/002689796173453 M. S. Wertheim "Fluids of hard convex molecules III. The third virial coefficient", Molecular Physics '''89''' pp. 1005-1017 (1996)]


==Convergence==
==Convergence==
#[http://dx.doi.org/10.1063/1.1704186    J. L. Lebowitz and O. Penrose "Convergence of Virial Expansions", Journal of Mathematical Physics '''5''' pp. 841-847 (1964)]
For a commentary on the convergence of the virial equation of state see <ref>[http://dx.doi.org/10.1063/1.1704186    J. L. Lebowitz and O. Penrose "Convergence of Virial Expansions", Journal of Mathematical Physics '''5''' pp. 841-847 (1964)]</ref> and section 3 of <ref>[http://dx.doi.org/10.1088/0953-8984/20/28/283102 A. J. Masters "Virial expansions", Journal of Physics: Condensed Matter '''20''' 283102 (2008)]</ref>.
==Quantum virial coefficients==
Using the [[path integral formulation]] one can also calculate the virial coefficients of quantum systems  <ref>[http://dx.doi.org/10.1063/1.3573564 Giovanni Garberoglio and Allan H. Harvey "Path-integral calculation of the third virial coefficient of quantum gases at low temperatures", Journal of Chemical Physics 134, 134106 (2011)]</ref>.
==References==
==References==
# H. Kammerlingh Onnes "Expression of the equation of state of gases and liquids by means of series", Communications from the Physical Laboratory of the University of Leiden '''71''' pp. 3-25 (1901)
<references/>
#[http://www.digitallibrary.nl/proceedings/search/detail.cfm?pubid=436&view=image&startrow=1 H. Kammerlingh Onnes "Expression of the equation of state of gases and liquids by means of series", Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen '''4''' pp. 125-147 (1902)]
'''Related reading'''
#[http://dx.doi.org/10.1088/0034-4885/7/1/312 James A Beattie and Walter H Stockmayer "Equations of state", Reports on Progress in Physics '''7''' pp. 195-229 (1940)]
*[http://dx.doi.org/10.1088/0034-4885/7/1/312 James A Beattie and Walter H Stockmayer "Equations of state", Reports on Progress in Physics '''7''' pp. 195-229 (1940)]
*Edward Allen Mason and Thomas Harley Spurling "The virial equation of state", Pergamon Press (1969) ISBN 0080132928
*[http://dx.doi.org/10.1063/1.4929392  Nathaniel S. Barlow, Andrew J. Schultz, Steven J. Weinstein and David A. Kofke "Analytic continuation of the virial series through the critical point using parametric approximants", Journal of Chemical Physics '''143''' 071103 (2015)]
*[https://doi.org/10.1063/1.5016165 Harold W. Hatch, Sally Jiao, Nathan A. Mahynski, Marco A. Blanco, and Vincent K. Shen "Communication: Predicting virial coefficients and alchemical transformations by extrapolating Mayer-sampling Monte Carlo simulations", Journal of Chemical Physics '''147''' 231102 (2017)]
 
[[category:equations of state]]
[[category:equations of state]]

Revision as of 12:15, 9 January 2018

The virial equation of state is used to describe the behavior of diluted gases. It is usually written as an expansion of the compressibility factor, , in terms of either the density or the pressure. Such an expansion was first introduced in 1885 by Thiesen [1] and extensively studied by Heike Kamerlingh Onnes [2] [3], and mathematically by Ursell [4]. One has

.

where

  • is the pressure
  • is the volume
  • is the number of molecules
  • is the temperature
  • is the Boltzmann constant
  • is the (number) density
  • is called the k-th virial coefficient

Virial coefficients

The second virial coefficient represents the initial departure from ideal-gas behaviour

where is Avogadros number and and are volume elements of two different molecules in configuration space.

One can write the third virial coefficient as

where f is the Mayer f-function (see also: Cluster integrals). See also [5]

Convergence

For a commentary on the convergence of the virial equation of state see [6] and section 3 of [7].

Quantum virial coefficients

Using the path integral formulation one can also calculate the virial coefficients of quantum systems [8].

References

Related reading