Does sound generate heat?

Yes, sound can generate heat. In fact, it practically always does, though the amount is generally too small to notice.

Sound and heat are different kinds of motion of atoms or molecules. Sound is an orderly motion, while heat is randomised. If atoms are squeezed close together at some point (maybe by a loudspeaker), they’ll bounce away from each other and, in turn, squeeze nearby atoms together. This leads to a wave of high-density peaks and low-density troughs, which we perceive as sound. As the wave travels, or hits objects, this orderly motion is disrupted and randomised, becoming heat.

Read more:

• Does the Sun make a sound?
• Where do sound waves end up?
• How does a soundbar simulate three-dimensional sound?
• Why does light travel faster than sound?

Asked by: Jenni Chater, Bournemouth

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