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Density is actually a comparison of two things. It's a RATIO. It is a comparison of the mass of something and the volume of that thing. Once we know an object's mass and its volume, we set up a ratio, and that will be the density. Weigh the rock. Put it on a scale. Let's say it weighed 100 grams. Then find its volume. Partially fill a graduated measuring container with water to s fixed level, drop in the rock, and then see how much the water level rose. That will be the volume. Let's say 10 cubic centimeters. Construct your ratio. 100 grams : 10 cubic centimeters We need to refine this a bit so we can make comparisons of the density of one thing to that of another. Let's reduce both measurements by a factor of ten. Dividing both the measurements by ten yields this: 10 grams : 1 cubic centimeter That's ten grams per cubic centimeter for the density of your rock. Grams per cubic centimeter is a common SI expression of the density of a material. If one looked up the density of, say, metals, for example, that's the way they would most likely be found.

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