Density is mass per unit volume. In other words, what is the weight of a volume of material?

Water is (at 4ºC) 1. This means 1 ml of water weigh 1 gram. *ρ** *= 1 g/cm^{3}.

The only thing common between any materials is volume. No matter what, 1ml will always be 1ml. Of course, 1 gram will always be 1 gram, but 1 gram might not have the volume of 1ml.

You can calculate the density of a material by measuring the volume of a mass (or mass of a volume) and do the calculation.

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