Define the relative density of a substance. Why does relative density have no units?

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Solution

The relative density of a substance is the ratio of its density to density of water.
Relative density of a substance = $\frac{D e n s i t y o f t h e s u b s \tan c e}{D e n s i t y o f w a t e r}$ .
The relative density is a ratio of two similar quantities (masses), it has no units. Thus, relative density is a pure number.

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Define the relative density of a substance. Why does relative density have no units?

The relative density of a substance is the ratio of its density to density of water. Relative density of a substance =DensityofthesubstanceDensityofwater.The relative density is a ratio of two similar quantities (masses), it has no units. Thus, relative density is a pure number.