What do you need to know to calculate the density of a rectangular solid?

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Weight and the product of the objects Length, Width, and Height in centimeters.
Hardness and weight
mass and the product of the objects Length, Width, and Height (a/k/a volume in cubic centimeters or cm3)
mass and temperature

mass and the product of the objects length, width, and height (a/k/a volume in cubic centimeters or cm3) is needed to calculate the density of a rectangular solid.