+15 science points on completion
Adult supervision required for this experiment. Ask a parent or teacher before starting.
Dr. Beaker · Lab Chemist
Great choice, Junior Scientist! Today we're doing the "Balloon in a Bottle Air Pressure" experiment. Let me explain what we'll discover together. Warm air inside the bottle cools in ice water, taking up less space — lower pressure sucks the balloon in. Warming the bottle makes air expand and push the balloon out. That's air pressure at work!
Ask an adult to help warm the bottle, then stretch a balloon over the mouth.