Marshmallow in a Syringe

Marshmallow grows and shrinks. Ask students to predict what will happen. Seal syringe tip; pull and push plunger. Key idea: Changing pressure changes the size of trapped gas pockets. Ask: Is the marshmallow making more air? Safety and cleanup: Needle-free syringe; no eating afterward. https://www.flinnsci.ca/globalassets/flinn-scientific/all-free-pdfs/dc91705.pdf