Figure 6. Path (radius) - time diagram for the diffusion of methylene blue in Jello in a petri dish

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