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I assure you that myself and everyone I know who works with or for NASA, the military, Boeing, Lockheed, Northrop, Raytheon, Ford, GM, Ferrari, Mercedes, and any other organization dealing very heavily with fluids treats the continuum assumption as being "perfect" except in rare circumstances. We will all continue not worrying about individual molecules and using that continuum assumption to design your planes, rockets, missiles, and cars like we always have. Your can worry about individual molecules if you wish.