Science presenter Jon Chase describes the difference between a ‘selectively permeable’ and ‘partially permeable’ membrane, as well as the terms ‘crenation’ and ‘lysis’. In doing so, he performs a rap about the basics of osmosis.
Spray a can of deodorant for several seconds and allow it to spread across the room. Define this movement of a substance from a higher to lower concentration as diffusion. Ask students to list the similarities and differences between diffusion and osmosis. Students could then complete a practical exercise to measure the change in mass of small sections of raw potato when placed into distilled water and different concentrations of sugar.