Okay, so let's play a game. Imagine you're trying to catch butterflies in a field. But, butterflies are really fast and hard to catch. That's why you need a net to catch them.
But, what if the net also had tiny holes in it? The butterflies might be able to slip through those holes and escape. That's where the Schmidt number comes in.
The Schmidt number is like a measure of how big the holes in the net are. But instead of talking about nets and butterflies, we're talking about fluids and molecules.
In a fluid, there are lots of tiny molecules floating around. Just like how butterflies can slip through holes in a net, these molecules can slip through tiny holes in a fluid.
The Schmidt number tells us how easy or hard it is for those molecules to slip through. A low Schmidt number means the holes are really big and the molecules can slip through easily. A high Schmidt number means the holes are really small and the molecules have a harder time slipping through.
So, in summary, the Schmidt number is like a measure of how easily molecules can move through a fluid. It's like the size of the holes in the net you use to catch butterflies – a low number means the holes are really big and the butterflies (molecules) can slip through easily. A high number means the holes are small and the butterflies (molecules) can't slip through as easily.