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It need not be.
Mathematically, the number of significant numbers should depend only on the number of significant digits in the measures for mass and volume used to calculate the density.
In real life, though, few substances are identical from one sample to another: their density can vary and a 2 sig fig density is usually the best compromise between accuracy and inclusion of all varieties of the substance.
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Earn +20 ptsQ: Why is density express in 2 significant number?
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