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If two substances have different densities then their mixture will contain different proportions depending on whether you look at their mass or volume.

For example, consider two substances, A and B where the densities of A and B are 1 gram per cc and 2 grams per cc, respectively. Suppose the mixture comprise 10 grams of A (= 10 cc) and 10 grams of B (= 5 cc). Then the total mass of A+B is 20 grams so that A accounts for 50% (10 out of 20) by mass. The total volume is 15 cc so A accounts for 67% (10/15) of the mixture.

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Q: What is the difference between percent by mass and percent by volume?
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