How Does This Rocket Nozzle Not Melt?!. #didyouknow

Added: 2026-05-18

[00:00:00]Take a close look. This rocket nozzle is being blasted by flames hotter than 3,000°. If it were made from ordinary metal, it would [music] melt within seconds. Yet, somehow it survives the entire engine burn. Most people assume the secret is simply heat-resistant materials, but in reality, the nozzle [music] constantly cools itself from the inside. At temperatures this extreme, normal steel would fail almost [music] instantly. Surprisingly, engineers often use copper because it transfers heat incredibly fast. [music] As soon as the rocket engine ignites, super cold liquid hydrogen flows through tiny channels inside the nozzle walls.

[00:00:30]The system works almost like blood vessels, carrying heat away before it can build [music] up. What's even more impressive is that the heated fuel isn't wasted. After absorbing the heat, it flows directly into the combustion chamber and becomes part of the engine burn itself. But if the cooling flow stops for even a few seconds, the [music] nozzle temperature can instantly go out of control and destroy the entire rocket engine.