Phineas, Ferb and friends try to determine the volume of a cylinder, but Buford solves it for them. This is a humorous introduction to the concept of volume of cylinders. There is a small little "bathroom humor" remark at the end to be wary of if you are dealing with a sensitive audience.
Bianca is babysitting a set of twin boys and needs to feed them exactly 9 ounces of baby formula. She tries to find two containers that have the same volume so that she can feed each baby the same amount. She tests out different containers and learns that, although some containers may look different, they can hold the same volume.
Digit, Jackie, Inez, and Matt miscalculate the amount of cryoxide they would need to fill Motherboard's tank. Her tank had more depth than they thought since part of it was hidden. They discuss how the shape of the container doesn't determine how much liquid it can hold; its total volume does. They use the contaminated junk they previously took out from the tank to determine how much more cryoxide to obtain.