Think of it like this: I can split myself right down the middle into two bottles.

Each bottle holds half a liter of water. That's exactly the same as 500 milliliters (500ml)!

But when I’m whole and totally full, I hold a whopping 1,000 milliliters (1000ml) of water.
Cubee "L"

Hey Super Students!
My name is Cubee "L", and I’m the official assistant to Cubee "D"!

While Cubee "D" is busy measuring straight lines, flat areas, and big 3D volumes, I have a very special job: I measure capacity!

That means I figure out exactly how much liquid (like water) or gas (like air) a container can hold. The coolest part? I can change my shape to fit inside anything, but I always hold the same amount,
1 liter!
And now for my next trick... I can transform into a Rectangular Prism!

A rectangular prism is a solid shape where every single side is a rectangle. To show you how much I can hold in this shape, imagine five juice boxes lined up. Each one of those little cardboard boxes holds 200ml of juice.

When you put all five together, you get 1,000ml—which is exactly one liter! That’s my specialty.
Watch this! I can even transform into a
Cylinder. That means I have smooth, straight sides with a perfectly round top and bottom.

In this shape, I can hold almost three cans of Diet Coke! I’m also super strong because I can hold onto a gas called carbon dioxide. That’s the "secret ingredient" that gives your favorite drinks their bubbly fizz.
Five Rectangular Prisms
This is an oblique drawing of a cubic decimeter container. The internal dimensions are 1dm x 1dm x 1dm. The container has a capacity of one liter.
45 degree angle