Sound is a form of energy.

Answer

### Step-by-Step Solution:

1. **Understanding Sound**:
- Sound is defined as a form of energy that is produced by vibrations. It travels through different mediums like air, water, or solids.

2. **Nature of Sound Waves**:
- Sound is made up of longitudinal waves. In longitudinal waves, the particles of the medium vibrate back and forth in the same direction as the wave is moving.

3. **Vibration of Particles**:
- When sound waves travel through a medium (like air), they cause the particles of that medium to vibrate. For example, if a sound wave hits an air molecule, that molecule vibrates and then transfers its energy to the next molecule.

4. **Energy Transfer**:
- As each molecule vibrates, it passes its vibrational energy to the adjacent molecules. This process continues, allowing sound to travel from one point to another.

5. **Conclusion**:
- Since sound involves the transfer of vibrational energy from one particle to another, we can conclude that sound is indeed a form of energy. Therefore, the statement "Sound is a form of energy" is true.