Heat. Sound is organized wavy physical movement of particles. Heat is disorganized random physical movement of particles. They’re already really pretty similar!
There’s not that much actual energy in normal amounts of sound, but there’s some. It all ends up as a small amount of heat. Here’s a calculation for [heating up a cup of coffee purely by screaming at it.](https://futurism.com/heating-coffee-by-screaming-2)
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