Question

what is meant by density of a substance​

Answer 1

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. ... Thus a relative density less than one means that the substance floats in water.

Answer 2

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The density of a substance is it's mass per unit volume.

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