What happens when you put a marshmallow in the microwave?
It makes a monster one!
Place a marshmallow on a microwave safe plate and set for 30 seconds. Watch closely. After the 30 seconds remove from microwave safely, the plate will be hot.
Marshmallows contain lots of air pockets. When air heats up and pushes against the soft sugary walls. Air is gas and when gases heat up the molecules they are made of start moving freely at high speeds. This creates the increase of pressure and the the expanding of the marshmallow.