Definition: A substance composed of a large collection of bubbles or their solidified remains.

Alright class, settle down and let’s take a look! You’ve got a great question today, it’s quite astute, About the word “foam,” bearing lovely fruit. The dictionary tells us, with precision clear, It's more than just bubbles, banishing fear! Let's break it down, piece by piece, you see, "A substance composed," that’s part of what we decree. Think of a bubbly bath, or waves upon the shore, Lots and lots of little bubbles, wanting more! Or maybe it’s solidified – dried right out, Like foam from shaving cream, without a doubt. It's a collection, a big and airy show, Of bubbles or their remains, you know! So “foam” is basically air trapped within, A lighter-than-air substance, where adventures begin. Do you understand? Any questions to share? Let’s discuss with care!