Extensive collection of experiments illustrating fundamental principles of physics. Demonstrations on this disc: Fluid Pressure - same level tubes, pressure vs. depth, pressure vs. depth in water and alcohol, pressure independent of direction, water / air compression, water and mercury u-tube, hydraulic press, hydrostatic paradox; Buoyancy - hydrometer, weight of air, bouyant force, Archimedes’ principle, board and weights float, different density wood, density ball, density balls in beans, battleship in bathtub, bouyancy in various liquids, floating square bar, helium balloo n in glass jar, helium baloon in liquid nitrogen, Cartesian driver. Kit contains: DVD with English and Spanish audio tracks and subtitles, and bilingual study guide.