“Why is the water wet?” says a nursery rhyme in my country. And the grown-up physicist is still striving to explain the macroscopically observable properties of matter in terms of the microscopic kinetics and dynamics of molecules. Since the simultaneous motion of a large number of interacting particles is not tractable by analytical means, statistical mechanics has always been obliged to introduce additional, simplifying assumptions whose effect upon the results is hard to estimate.
KeywordsStatistical Mechanic Hard Sphere Pair Correlation Function Stochastic Force Free Flight
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