what is the Bulk modulus for a perfect rigid body ?

Explanation

To find the bulk modulus for a perfectly rigid body, we can follow these steps:

### Step 1: Understand the Definition of Bulk Modulus
The bulk modulus (B) is defined as the ratio of bulk stress to volumetric strain. Mathematically, it is expressed as:
\[ B = \frac{\text{Bulk Stress}}{\text{Volumetric Strain}} \]

### Step 2: Define Bulk Stress and Volumetric Strain
- **Bulk Stress** is the change in pressure (ΔP) applied to the body.
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