Is it known what is the critical value for the number of particles (atoms, molecules) below which the system can not be described as a continuous media Wikipedia?

  • $\begingroup$ It would depend entirely on the physics that you're interested in modelling. In the case of mechanical stress, for instance, this paper places the threshold at approximately 5 nm. $\endgroup$ – lemon Nov 5 '17 at 11:10
  • $\begingroup$ @lemon It depends on the physics. How about fluids? $\endgroup$ – WoofDoggy Nov 5 '17 at 11:12
  • $\begingroup$ Related: physics.stackexchange.com/q/102132/25301 $\endgroup$ – Kyle Kanos Nov 5 '17 at 11:51

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