For demonstrating a body floating, sinking or rising in water. A hollow figure made of colored glass, with a narrow opening. The figure floats upright in a cylinder filled with water and can be made to float, sink or rise by applying pressure to the rubber cap. The rubber cap fits cylinder diameters of approx. 30 mm to 40 mm, e.g. U14206 free-standing cylinder.
1 Cartesian diver
1 Rubber cap