Abstract

We may constantly observe ordered macroscopic processes in nature: wind, generation of clouds, precipitation, the flow of rivers, etc. The ordered motion of molecules of a substance is always envisaged as the opposite of their chaotic (non-correlated) thermal motion. The ordered character of such motion means that a single molecule or a group of molecules appears to be related (correlated) in its motion to that of another such molecule or group of molecules. For example, all the molecules of water in a river have a downstream velocity component. During turbulent flow in whirlpools macroscopic groups of molecules feature identical angular velocities. The phenomenon of wind means that all the molecules of air have a common velocity component.

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