Thermoacoustic heat engine

A thermoacoustic heat engine is basically a machine that turns heat energy into sound and then back into heat energy again. It works like this: first, the heat energy is used to vibrate a gas (usually air) inside a tube. This vibration creates sound waves, which can be used to power an engine. Then, the engine vibrates the air again and the sound waves created turn back into heat energy. And that's how it works!