Physics The Bottle of Water with a Sachet of Mayonnaise   A sachet of mayonnaise in a bottle of water     Subject Pressure Level Upper secondary Language English Type Experiment, exercise, lecture   This hydrostatics project begins with an amusing experiment which has quite a difficult solution: a sachet of mayonnaise is made to float in a closed plastic bottle that is filled with water. The sachet descends when the bottle is squeezed, then when the grip on the bottle is released the sachet once again floats. When asking the students to try to explain this operation we head down a curious and fun path of knowledge where all the concepts of hydrostatics are met (through this experiment and other simple ones).     Contact details   Name Francesco Serafini Email millo_76@hotmail.com       Last update: 17 July 2007 More Physics Teaching Ideas  •  A Boomerang Project (http://www.esa.int/SPECIALS/Science_on_Stage/SEMLVJC4VUE_0.html)  •  "Seeing" Alternating Current (http://www.esa.int/SPECIALS/Science_on_Stage/SEM3HKC4VUE_0.html)  •  A Merry-go-round as Alternative to the Wind Tunnel (http://www.esa.int/SPECIALS/Science_on_Stage/SEMWO8ANMUE_0.html)  •  Electrodynamic Levitation and Travelling Magnetic Wave (http://www.esa.int/SPECIALS/Science_on_Stage/SEMFA58OY2F_0.html)  •  You Can Do It (http://www.esa.int/SPECIALS/Science_on_Stage/SEMRE58OY2F_0.html)  •  Irish Teaching Ideas Booklets from POS2 and POS3 (http://www.esa.int/SPECIALS/Science_on_Stage/SEMTO58OY2F_0.html)  •  Handling the Canter of Mass (http://www.esa.int/SPECIALS/Science_on_Stage/SEMQ968OY2F_0.html)  •  Reflection Study (http://www.esa.int/SPECIALS/Science_on_Stage/SEMCO78OY2F_0.html)  •  Testing UV Absorption Effectiveness of Sun Screen (http://www.esa.int/SPECIALS/Science_on_Stage/SEMM888OY2F_0.html)  •  E=mc2 (http://www.esa.int/SPECIALS/Science_on_Stage/SEM3G88OY2F_0.html)  •  The Magic Castle (http://www.esa.int/SPECIALS/Science_on_Stage/SEMBZ88OY2F_0.html)  •  Let’s prove the 4th Maxwell Equation (http://www.esa.int/SPECIALS/Science_on_Stage/SEM3898OY2F_0.html)  •  Leonardo's Anemometer (http://www.esa.int/SPECIALS/Science_on_Stage/SEMND98OY2F_0.html)  •  The Physics Teacher (http://www.esa.int/SPECIALS/Science_on_Stage/SEMH4H8OY2F_0.html) Download  •  A Bottle of Water with a Sachet of Mayonnaise PPT (http://esamultimedia.esa.int/docs/scienceonstage/IT_Serafini_Bottel_ water.ppt)