Although I don't get to teach this unit anymore due to a grade level change, I still get invited to participate with my old team. At the end of the unit, we have a root beer float party.
LIQUID- root beer
GAS- the bubble forming from the root beer being poured.
Once the kids, observe, eat and discus. they then write all about it. For something so simple it is one of their laborite captivities of the whole year.