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Covers the study of (primarily homogeneous) macroscopic systems from a heat/energy/entropy point of view. Consider also using the tag: [statistical-mechanics].

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How could we estimate the number of molecules below which a fluid cannot be adequately model...

The Knudsen number is really only useful in dilute gases, where molecules typically fly a long way between collisions. For a dense fluids such as water, this is almost certainly not a good measure of …
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