Why are sound waves called mechanical waves ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Waves**: Waves can be classified based on their mode of propagation. The two main categories are mechanical waves and electromagnetic waves.

2. **Definition of Mechanical Waves**: Mechanical waves are defined as waves that require a medium (solid, liquid, or gas) to travel through. This means they cannot propagate in a vacuum.

3. **Definition of Electromagnetic Waves**: In contrast, electromagnetic waves do not require a medium for propagation. They can travel through a vacuum, such as light waves.

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