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2B40.14 - Archimedes' Principle
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2B40.15 - Finger in Beaker
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2B40.25 - Submarine in the Water
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2B40.26 - Boat in the Water
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2B40.30 - Cartesian Diver
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2B40.40 - Weight of Air
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2B40.59 - Density Ball
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2B40.60 - Hydrometers
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2B40.u1 - Lung Apparatus
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2B40.u2 - Buoyancy - Coke and Diet Coke
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2B40.u3 - Ball in Oil and Water
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