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Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.

Learners build a simple one-cell battery and use an ammeter to measure the flow of current.

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.