Answer the following: Can sound travel in vacuum ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Sound Waves**: Sound is defined as a vibration that propagates as an audible wave of pressure through a medium. This medium can be a gas (like air), a liquid (like water), or a solid (like metal).

2. **Nature of Sound Waves**: Sound waves are classified as mechanical waves. This means they require a medium to travel through. Without a medium, sound cannot propagate.

3. **Definition of Vacuum**: A vacuum is defined as a space that is devoid of matter. This means there are no particles (atoms or molecules) present in a vacuum.

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