Evaluating Water Bottles

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Display the water bottles to the class, and ask students which bottle is bigger. They should identify the bottles are the same size. Fill one bottle with 200 ml of water, and the other with 200 ml of sand. Have students verify the amount of sand and water being poured. Ask “which bottle has more mass?” Have students make predictions in their science journals. Allow for discussion, and then prove the bottle with sand has more mass by placing them on the balance scale. Pose the question, “If we measure both bottles using the water displacement method, which bottle will displace the most water?” Direct students to write their predictions in their science journal, and share their answers. Expect most students to
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