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A rough calculation or an approximation of the value, number, quantity, or extent of something so that it is usable for some purpose even if the input data may be incomplete or uncertain.
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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 …