This is an interesting experiment to try out when doing the topic, Organic Chemistry. Look at what happens when acetone is poured on a styrofoam cup. Acetone is commonly found in nail polish remover.
Styrofoam is made up of polystyrene with air bubbles trapped inside. Polystyrene is a type of polymer. When acetone is added, the styrofoam becomes soft, releasing air bubbles.
IGCSE Science: Styrofoam cup dissolves