density = mass/volume
Determine the volume of the screw by using the water displacement method (see related link below). Determine the mass of the screw on a balance or scale. Divide the mass by the volume, and that will be the density.
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Mass and volume are needed to calculate the density of a graduated cylinder.
You need the mass and volume to calculate the density
density = mass/volumemass = density*volumevolume= mass/density
density=mass/volume volume=mass/density
volume*density