Upside down water glass trick.. IMPROVING A GREAT DEMONSTRATION

Improved versions of a classic demonstration, the simple water glass turned upside down has a new twist when a balloon is used instead of a flat card.. The seal is improved enough that the jar of water can shaken and spun around without the water being spilled out. The weight of water inside the jar causes a slight pressure drop inside the container and the cohesive attraction between the water molecules hold them together when turned upside down, with a lower pressure inside the jar, atmospheric pressure pushes against the covering, which in turn seals the opening of the jar so the water stays inside. This behavior would be similar to the action of a suction cup. MISTAKE: maximum water column should be 33.9 feet which converts to 10.3 meters. Absolute zero is usually referred to as a measurement of temperature, in this case the absolute pressure is zero meaning it is a vacuum. Special thanks to Homemade Science Junior (my granddaughter, Ella Yeany and friend.. watch at