What do you mean by amplitude of a sound wave ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Amplitude**: Amplitude refers to the maximum displacement of a particle from its mean (or rest) position in a sound wave.

2. **Understanding Mean Position**: The mean position is the equilibrium position where the particles of the medium would rest if there were no sound wave passing through.

3. **Displacement in Sound Waves**: When a sound wave travels through a medium, it causes the particles of that medium to oscillate about their mean position. The displacement of these particles can vary, and the maximum value of this displacement is what we call the amplitude.

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