Expanding Creature

Drop the polymer creature in a bowl of water and watch it expand over the next 5 days.  Students can record and graph the changes. The mass can increase to more than 10 times the original mass! Then remove it from the water and observe the reversible process.  Another exciting osmotic process in action.

Age:  5 to 12 years
Included: 1 creature (croc or lizard), 1 instruction sheet