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With glass vessels of 4 different shapes mounted in leak proof metallic collars mounted on a metal base. Mounted on moulded plastic base. To show that the pressure of liquids depend upon their height and the surface of bottom of the columns and not on the capacities of the vessels, with plastic / glass vessels of four different shapes mounted on leak proof metallic collars, all parts of metal are painted. Mounted on moulded plastic base of size 20 x 12.5 cm