Diffusion factors and Fick's Law

Lesson on the factors affecting diffusion and using Fick's Law. I set up the tea based practicals around the room, for the students to rotate their way through, with the accompanying powerpoint slides printed out on the tables with the equipment. (You will need teabags of different shapes, loose leaf tea, a strainer or mini-sieve, 'X' printed to put under the beaker to watch it disappear as the tea diffuses, kettles)