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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

Learners work in pairs to design, construct, and test a device that exhibits positive, neutral, and negative buoyancy. They test a number of different objects in water to see if they sink or float.