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This is a bathtub using the Archimedes Principle.The scales on the bathtub represents how much water needed for people of different body weight. When you bath, you can easily know how much water you will need to fill dependingon how much you weigh, as a result, preventing overfilling the bathtub and wasting water.
Huang Shao-Heng Wang Shou-Yu Shih Chang-Chi