Dimensions of relative density is

Explanation

To find the dimensions of relative density, we can follow these steps:

### Step 1: Understand the Definition of Relative Density
Relative density (RD) is defined as the ratio of the density of a substance to the density of a reference substance (usually water at 4 degrees Celsius). Mathematically, it can be expressed as:
\[ \text{Relative Density (RD)} = \frac{\text{Density of Substance}}{\text{Density of Reference Substance}} \]

### Step 2: Write the Expression for Density
Density is defined as mass per unit volume. The formula for density (\( \rho \)) is given by:
...