Kent Treadgold's 7th grade science class uses a hands-on project to learn the abstract concept of density. They measure the mass and volume of different cylinders, create their own computerized spreadsheets for data, and enter the formula to calculate density. By the end of the project, they're able to conclude on their own that density will not change as the shape and size of an object changes, as long as the material it's made of stays the same.
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