A set of four hands-on science labs using Cartesian Divers. There are instructions on how to make these divers on the internet or you can buy a kit. They are simply an eyedropper and a 2 liter bottle with water, a wire and a nut. Gives students an understanding of displacement, compression, air pressure, etc.
Includes a poster (you can enlarge) on buoyancy and one on density now!