Why the Serpentine Coil is Such a Smart Design

You've probably seen a serpentine coil without even realizing it, likely while poking around the back of an old refrigerator or looking at the inner workings of an air conditioner. It's one of those engineering marvels that looks incredibly simple—just a tube bent back and forth in a continuous "S" shape—but it's actually doing some pretty heavy lifting when it comes to managing temperature. ...

February 10, 2026 · 7 min · Riccardo Ludy