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Kids can find the density of virtual objects and predict if they will float or sink with the interactive online lab Mass, Volume, Density: Floating Lab 101.  Find the mass of an object using the scale, and find the volume using the graduated cylinder.  Divide the mass by the volume to get the density.  (Hint: 1ml is equal to 1 cubic cm)  If the density is less than the liquid, it will float.  If it is more dense, it will sink.  This educational website is recommended for kids 8 and up.