Product Number: SB29011
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Grades 9-12. Demonstrate the mechanics of fluid by visually comparing the viscosity of four different liquids. Each tube contains a different weight liquid and a 3/8 in. plated steel ball. The balls are lifted just above the line on the tube with a magnet and then released. Students compare the time for the balls to fall. Liquids not included. Comes with instructions. WARNING: Choking Hazard. Toy contains a marble. Not for children under 3 yrs.