The density of a substance in `"0.9g/cm"^3`
Find its relative density

Explanation

To find the relative density of a substance given its density, follow these steps:

### Step 1: Understand the concept of relative density
Relative density (also known as specific gravity) is defined as the ratio of the density of a substance to the density of water. The formula for relative density (RD) is:

\[ \text{Relative Density (RD)} = \frac{\text{Density of substance}}{\text{Density of water}} \]
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