What is thickness?

Thickness is how big something is from one side to the other, like how tall a block of building bricks is.

Imagine you have a stack of your favorite cookies. If you put just one cookie on the table, it’s not very thick, it's only as thick as one cookie. But if you add more cookies on top, stacking them up like little mountains, the thickness gets bigger and bigger. Each cookie adds to how tall that stack feels.

Think of a book. A thin book is like a short story, it doesn’t take long to read. But a thick book is like an encyclopedia, you could spend days reading it! The thickness of the book tells you how many pages are inside, just like stacking more cookies makes your cookie tower taller.

Or think about a sandwich. A single slice of bread isn’t very thick, but if you have two slices, or even three, your sandwich becomes bigger and squishier, that’s thickness in action!