Simple air pressure difference is all the glue you need to lift a plate with a jar. This activity is a great way to reveal how air pressure differences cooperate. An airplane flies because of these differences cooperating but you can’t see them at all.
Here’s a modern-day version of the hard-boiled egg and a glass milk bottle experiment using a juice bottle and a water balloon. You’ll also get a chance to try your hand at getting a real egg into a juice bottle using a cool, upside down twist.