Figure 2. 3D random walk (left); simplified 1D random walk with indication of the probabilities for particle displacements after n = 3 steps (right) (cf. )

From

Understanding Diffusion and Demonstrating it Correctly – A Critical Look at a Transport Process often Incorrectly Taught in Schools

Philipp Meyer

International Journal of Physics. 2024, 12(5), 238-246 doi:10.12691/ijp-12-5-7