De Laval nozzle

Have you ever seen a rocket ship? It has this really cool fire coming out of the bottom, right? Well, that fire is made by burning fuel – kind of like the fire in a car's engine. But how does it make the rocket ship go so fast?

One of the secrets is in something called a De Laval nozzle. Think of it like a special kind of straw that's shaped like a cone. When the hot gases from the burning fuel gets pumped through the nozzle, it speeds up, kind of like blowing more air through a regular straw. This creates a super-fast, powerful jet of gas that propels the rocket forward.

So, just like when you blow up a balloon and let it go, the air rushes out of the nozzle and makes the rocket move really fast. And the best part about a De Laval nozzle is it's super-efficient – that means it uses less fuel to make the rocket go really fast!