Editing Marshmallow Smashies (section)

== Demonstration ==

;Preparation: connect the vacuum flask to the hose for the pump. Draw faces or animals on the marshmallows that you will use, or set out the ones you plan to use with some markers so you can have volunteers draw on them.
;Presentation:
# Show the marshmallows to the audience. If they do not have faces yet, and if you have a younger audience, call up a few volunteers to draw on the marshmallows. Ask the audience or the volunteers to give the marshmallows names.
# Place the marshmallows inside the vacuum flask, and put the racquetball on top. Ask the audience for ideas on what will happen to the marshmallows if you removed the air inside the flask.
# Ask for a countdown, and at the end of the countdown turn on the pump. Hold up the flask so the audience can see the marshmallows expanding!
# The marshmallows will expand for a few seconds, and then stop and start to shrink slowly. When they start to shrink, turn off the pump and pull the racquetball off the top, letting out a loud popping noise and smashing the marshmallows!
# Show the smashed marshmallows compared to regular sized ones. Ask the audience for ideas on what happened, then explain the demo, using the balloon to show how air will expand in a vacuum.