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'''Thermostatistical ensembles''' are collectives whose average behaviour reflects the actual behaviour of a physical system. Ensembles are fundamental in the study of [[statistical mechanics]]. From one point of view they can be seen as mathematical labour-saving devices, given the intractability of following the trajectory of a macroscopic system in its journey through [[phase space]]. For example, celestial mechanics is hard enough, however, the [[Avogadro constant]] is on a par with the total number of stars in the universe. Clearly one needs a device that adequately represents the system of interest. Ensembles provide a link between the expectation value of physical observables (such as [[temperature]], [[internal energy]] etc.) and the individual motions of the plethora of constituent atoms and/or molecules.
'''Thermostatistical ensembles''' are collectives whose average behaviour reflects the actual behaviour of a physical system.
==History==
==History==
The concept of thermostatistical ensembles was introduced by [[Josiah Willard Gibbs]] (Ref. 1-3). [[Albert Einstein]] also made contributions  (Refs. 4 and 5).
The concept of thermostatistical ensembles was introduced by [[Josiah Willard Gibbs]] (Ref. 1-3). [[Albert Einstein]] also made contributions  (Refs. 4 and 5).
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