Meaning of statistical mechanics

statis'tical mechan'ics

Pronunciation: [key]
— Physics, Chem. (used with a sing. v.) Physics,Chem.(used with a sing. v.)
  1. the science that deals with average properties of the molecules, atoms, or elementary particles in random motion in a system of many such particles and relates these properties to the thermodynamic and other macroscopic properties of the system. Also calledCf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.