GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Mass measurement. A small digital scale is used to measure the mass of two paper clips (left panel) and the mass of many packing peanuts (right panel). While the mass is the same (1.0 gram), packing peanuts occupy much larger volume because of their lower density, as compared to the paper clips (plastic-covered steel).
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