Interactive pages for engineering students. Each one runs a model of a physical or mathematical process in your browser: change the settings, press Play, and compare what you see with the equations from class. Every page has Notes with the theory. Nothing to install; they work on a laptop or a phone.
Probability and random processes
Random walk model of diffusion
Molecules take random steps in 1D, 2D and 3D. Watch the cloud spread, and test whether its size grows in proportion to t, t² or √t.
ChE Analysis 3020DiffusionVariance