We have been doing some science experiments from the book 101 Great Science Experiments by Neil Ardley.
The experiments are easy, the pictures are great, and most of the items needed are things we have around the house.
Our first experiment: How can you crush a plastic bottle without touching it?
Fill a bottle with HOT water. Leave it sitting a little while before screwing on the lid. Lay the bottle in a bowl and cover it with ice and water.
Then stand the bottle up and watch the bottle collapse. We discussed warm air and cool air and which exerts more pressure.
Our second experiment: How can you inflate a balloon without blowing into it or using a pump?
Pour vinegar into a bottle. Fill a balloon with some baking soda.
Stretch the neck of the balloon over the neck of the bottle. Slowly lift the balloon and add the baking soda.
This forms a gas (carbon dioxide) that will inflate the balloon.
Lots of fun and not much mess to clean up.