Learn about the force of buoyancy and how it affects bath times, boats and bladders. Find out about the scientist behind the discovery, Archimedes, and follow along with an experiment where you can observe buoyancy in water using a homemade Cartesian& diver!
To do this experiment, you'll need a plastic bottle, a pen cap (ideally one without a hole at the top), plasticine or re-usable tack and cold water.
Make sure you have an adult's permission and supervision. This experiment is suitable for ages 5 and over. Watch on YouTube.