Why does sound travel faster in solids than in air?
Quick Answer
Sound is a vibration passed from particle to particle, and solids have tightly packed particles that transmit that vibration quickly. Air is much less densely connected, so sound travels more slowly.
The Full Story
Sound is not a thing moving through empty space; it is a mechanical wave carried by matter. In solids, atoms are close together and strongly linked, so a disturbance passes rapidly from one particle to the next. In gases like air, particles are farther apart, so the wave moves more slowly. This is why you can often hear a train through the track before you hear it through the air. The exact speed depends on the material and temperature, but the pattern is always the same.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Why can sound race through metal so fast?"
Was this answer helpful?
Tap a reaction — it helps us pick what to cover next.