Adolf Fick's 2nd Law of Diffusion is about how molecules move from areas of high concentration to areas of low concentration. In high concentration areas, they're more likely to bump into each other. Eventually things even out and the concentration within a given space is the same in all parts.
This law should also apply to train spaces. High concentration areas have more of a tendency for disorder because people can bump into each other and get in each other's way. So it's best to spread out evenly. If there are 8 people in a car and 5 are on one side, I will choose to sit on the opposite side with the 3 people. On a crowded train, I will look for that one area of low concentration. It sounds logical, doesn't it? Well... not to everyone. I'm always extra suspicious whenever a passenger doesn't obey this law... if I have a seat on an empty train and someone sits right next to me. I become more alert to that person's actions.
Related Links: Diffusion @ Wikipedia, Fick's Law of Diffusion @ Wikipedia
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