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Use a balance with known masses on the other side.
Different metals have different densities, so to find the density either the type of metal or both the size and mass of the cube must be provided. Density is mass divided by volume.
You would need a balance to measure its mass. You would need a ruler to measure the length of its sides. Then you would need to calculate volume. Then divide the mass by the volume to get density.
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It's called "the mass of the cube" or "the cube's mass".