If soundwaves are compression waves in air molecules, and thermal energy is vibrations in air molecules, why aren’t loud things hot?

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Like if I have a really bright flashlight I can feel heat from the beam, but I can blast a speaker at max volume and I might even feel the vibrations in my hand, but there’s no change in temperature.

Is this a glitch in the matrix?

In: Physics

7 Answers

Anonymous 0 Comments

Sound energy will cause temperature rise but it will be hard to measure outside a controlled experiment in a lab. One reason is that most of the time, it isn’t a lot of energy converted to heat in the air and source of sound isn’t high energy to begin with relatively speaking.

A 50 W sound system might drive a speaker to produce a few watts of actual sound energy and, in a regular room, that is pretty loud. Loud enough that most people won’t tolerate it. It would be hard to detect a temperature difference even if these few watts converted to heat. Most of the heat would come from the electronic equipment, the lights in the room, the body heat of people inside – all of which release much more heat into the room.

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