In how many directions does water move in a sponge?

Well, we already know from the introduction that water diffuses from an area of high concentration of water molecules (i.e. Record their weights*.Ĭomparison of before & after weights – this Gummy Bear gained 6.39gĥ) Finally, measure the volume of water left behind in the enlarged bear’s cup…has it altered? Where has it gone?

Weighing scales/balance that can weigh to 0.1g increments.ġ) Take 2 gummy bears that are the same colour and similar size.

Kitchen item for measuring liquids, e.g.

Water (and other liquids for the extended project).

In this osmosis experiment the water molecules move into the bear, thus enlarging it. The Gummy Bear has a selectively permeable coating which will allow water molecules to diffuse across, but inhibiting other larger molecules. These membranes can be found in nature, such as membranes surrounding cells or synthetically made membranes. Selectively permeable is a membrane which allows some molecules to pass through but inhibits others. Osmosis is the diffusion of water molecules from a dilute liquid (where there are many water molecules) to a more concentrated solution (where there are fewer water molecules) across a selectively permeable membrane.

OK, so lets start at the beginning…… What is Osmosis? It’s also an experiment you can eat when you’re finished! Read on to find out why the Gummy Bear Osmosis Experiment is so good at teaching osmosis (obviously!), but also experimental design, mass, weight & volume as well as embedding maths. Gummy Bear Osmosis experiment is a fun demonstration to help explain the tricky subject of osmosis, as well as being a great way to teach experimental design. This is an ideal activity for the GROWTH theme of British Science Week 2022.

In how many directions does water move in a sponge?