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A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity.
Weight Slotted Set of 5, 5g
Slotted masses are used in student lab classes, to teach physics and other sciences. Slotted masses allows a student to quickly create any desired amount of mass, to use in experiments involving force, acceleration, and mass.
Weight With Hooks
Weight hangers are used in physics experiments and education related to masses, force, pendulum, friction and many more. You can modify the weight or mass of a weight hanger by adding slotted weights to it or removing slotted weights from it.
Venturi Tube 
Ammonia Solution 
Universal Indicator Ph 1-14 Solution 
