Precooled jet engine

Imagine you're playing with a bunch of toys, like toy cars and toy planes. Your favorite toy is a toy plane, and you love watching it fly through the air. Sometimes, your toy plane gets too hot and needs to rest for a while before it can fly again.

A precooled jet engine is like a special toy plane that can fly longer and faster without getting too hot. It has a special super-cooling system that helps it stay cool while it's flying. This special cooling system uses a gas called hydrogen which is really, really cold.

As the air goes into the engine, it gets super cold thanks to the hydrogen gas. This cold air helps cool down the engine so that it doesn't get too hot while it's flying. When the engine is cooler, it can work better and go faster.

So, a precooled jet engine is like a really cool toy plane that can fly longer and faster without getting too hot thanks to its special super-cooling system.