## Statistical Physics, Volume 5Elementary college physics course for students majoring in science and engineering. |

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Page 33

Density fluctuations in a gas Consider an ideal gas which is in equilib. rium and

consists of a

Focus attention on the number n, of molecules located within some specified ...

Density fluctuations in a gas Consider an ideal gas which is in equilib. rium and

consists of a

**large number**N of molecules confined within a box of vol. ume V.Focus attention on the number n, of molecules located within some specified ...

Page 57

... we proceed in the following way: Instead of focusing attention on the single

system A of interest, we contemplate an assembly (or an ensemble, in more

customary terminology) consisting of some very

systems.

... we proceed in the following way: Instead of focusing attention on the single

system A of interest, we contemplate an assembly (or an ensemble, in more

customary terminology) consisting of some very

**large number**of of “similar”systems.

Page 122

(6) oc (e — eo)" where a ~ 1, (33) i.e., where o is some

unity.t Consider now the entire system with f ... Hence the value of the energy E (

in excess of its lowest possible value Eo) should be roughly f times as

the ...

(6) oc (e — eo)" where a ~ 1, (33) i.e., where o is some

**number**of the order ofunity.t Consider now the entire system with f ... Hence the value of the energy E (

in excess of its lowest possible value Eo) should be roughly f times as

**large**asthe ...

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### Contents

Characteristic Features of Macroscopic Systems | 1 |

A I | 2 |

I | 6 |

Copyright | |

26 other sections not shown

### Common terms and phrases

absolute temperature absorbed accessible approximation assume atoms average Avogadro's calculate classical collision Consider constant container corresponding cules denote discussion distribution ensemble entropy equal equilibrium situation equipartition theorem example exchange energy expression external parameters fluctuations function given heat capacity heat Q heat reservoir Hence ideal gas initial internal energy interval isolated system kinetic energy large number left half liquid ln Q macroscopic parameters macroscopic system macrostate magnetic field magnetic moment magnitude mass mean energy mean number mean pressure mean value measured mechanics mole molecular momentum number of molecules occur oscillator particle particular partition phase space piston position possible values Prob quantity quantum numbers quasi-static random relation result simply solid specific heat spin system statistical statistical ensemble statistically independent Suppose thermal contact thermal interaction thermally insulated thermometer tion total energy total magnetic total number unit volume velocity