Marshmallow in a Syringe
Marshmallow grows and shrinks.
Teaching & key ideas
What you do: Seal syringe tip; pull and push plunger.
What students see: Marshmallow grows and shrinks.
Why it works: Changing pressure changes the size of trapped gas pockets.
Question to ask: Is the marshmallow making more air?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Is the marshmallow making more air?