BONUS TRACK: Freeze and observe liquid expansion

 As you explore the states of matter, experiment to see if some types of liquid expand more than others when frozen.

Fill a bottle with milk, put a mark on the level. Do the same with other liquids like juice, salty water, or sugar water.

Then, put them in the freezer and after a couple of hours compare levels.

This way, you can check liquid expansion on different liquids.