Okay kiddo, let me explain Galilei numbers in a way you can understand. Have you ever played with building blocks? You know how you can stack them on top of each other and make a really tall tower? Well, Galilei numbers are a little bit like that!
Galilei numbers are a type of number that scientists use to explain the way things move. You see, when things move around, they create something called "angular momentum." That's just a fancy way of saying that they're spinning or rotating in some way.
Now, imagine that you have two building blocks stacked on top of each other, and you're spin them around in a circle. That spinning motion creates angular momentum. And depending on how fast you spin them and how heavy the blocks are, you'll get a certain amount of angular momentum.
Galilei numbers help scientists figure out how much angular momentum something has. They take into account things like an object's mass, how fast it's moving, and how big it is.
So basically, Galilei numbers are like a special kind of code that scientists use to describe how things move and spin around. It's kind of like a special language that helps them understand the world around us!