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Ensembles (Read 1783 times)
Gerrit-Jan Linker
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Ensembles
28.06.10 at 11:40:50
 
Ensembles
 
An ensemble is a large number of replica's of a system, e.g. all configurations calculated in a simulation. It is a collection of possibly accessible states of the system.
 
There are 3 common types of ensembles:
  • (E,V,N): Microcanonical ensemble  
    Constant energy E, volume V and number of particles N
  • (T,V,N) Canonical ensemble  
    The system is allowed to exchange heat with the environment but at a constant temperature T, volume V and number of particles N.
  • (T,P,N) Isothermal-isobaric ensemble  
    Constant temperature T, pressure P and number of particles N
  • Grand canonical ensemble
    The system can exchange both heat and particles with the environment, at fixed temperature, volume, and chemical potential.

 
Ensembles can be transformed to each other through a Legendre transformation.  
 
See also:
Ensemble average
http://www.oraxcel.com/cgi-bin/yabb2/YaBB.pl?num=1275218483/0#0
 
Source:
http://www.pumma.nl/index.php/Theory/Ensembles
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« Last Edit: 28.06.10 at 16:25:22 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
Linker IT Software
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