Liquid helium

Okay kiddo, have you ever seen balloons that float in the air? That's because they're filled with a gas called helium. But did you know that there's also something called "liquid" helium?

When something is a liquid, it means it's like water - it can pour and flow. Just like how you can pour water from a cup into another cup, you can pour liquid helium from one container to another.

But here's what's really cool - liquid helium is VERY cold. Like, REALLY cold. So cold that if you touched it, it would give you a frostbite. That's because helium can turn into a liquid when it's cooled down to almost 460 degrees below zero Fahrenheit!

Now, you might be wondering why anyone would want to use liquid helium. Well, scientists use it a lot for really important things like in MRI machines to help doctors see inside our bodies. The liquid helium cools down the magnets inside the machine so they work correctly. It's also used in rocket fuel, in gas turbines for power plants, and in cooling down things like computers and scientific instruments that need to be super cold to work properly.

So that's liquid helium, in a nutshell. It's a really cold liquid that scientists use to do really important things. Pretty cool, huh?