State three characteristics of the medium required for the propagation of sound in a medium.

Explanation

### Step-by-Step Solution:

1. **Elasticity of the Medium**:
- The medium through which sound travels must be elastic. This means that the particles of the medium can return to their original position after being disturbed. Elasticity allows sound waves to propagate as the particles vibrate and transfer energy to adjacent particles.

2. **Inertia of the Medium**:
- The medium must possess inertia. Inertia is the property of matter that causes it to resist changes in its state of motion. This characteristic allows the particles of the medium to store and transfer mechanical energy when sound waves pass through.

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