Diffusion


The model for the diffusion of black particles within a white (invisible) fluid. Initially all of the black matter is located in a small fraction of the container and its concentration there is high. As black particles move, they occasionally collide with container walls or with white particles, changing the direction of their velocities. After a long period the concentration of black matter equalizes within the whole container.

This is the supplementary material of the book 'Building physics'. Contact address: [].

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