Homemade Science with Bruce Yeany | Upside down water glass trick.. IMPROVING A GREAT DEMONSTRATION @YeanyScience | Uploaded September 2024 | Updated October 2024, 1 week ago.
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. 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.
Special thanks to Homemade Science Junior (my granddaughter, Ella Yeany and friend.. watch at youtube.com/watch?v=QnKqM2uta_g
The original video was temporarily removed due to some questions about the explanation on the role of the cohesive forces of water and their role in the demonstration. I revised it and reposted it as this video without that part of the explanation. After running some additional tests, I am satisfied with my theory on the behavior of liquids in this demonstration so I have reposted the original. I will leave both of these online. However, I am working on a second video of this demonstration to test additional ideas and answer some of your questions.
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. 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.
Special thanks to Homemade Science Junior (my granddaughter, Ella Yeany and friend.. watch at youtube.com/watch?v=QnKqM2uta_g
The original video was temporarily removed due to some questions about the explanation on the role of the cohesive forces of water and their role in the demonstration. I revised it and reposted it as this video without that part of the explanation. After running some additional tests, I am satisfied with my theory on the behavior of liquids in this demonstration so I have reposted the original. I will leave both of these online. However, I am working on a second video of this demonstration to test additional ideas and answer some of your questions.
