Fountain in a Bottle

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• This is an application of the previously published Water Fountain 4 (Cartesian Diver). We attempt to create a fountain in a jug.
• By pulling the end of the rubber balloon that covers the mouth of the jug, a fountain is created inside. How does it work?
• First, we prepare a small bottle and connect the inside and outside of the bottle by inserting a straw into the mouth. This bottle is placed upside down in a jug filled with water. At this time, the bottle should be weighed to prevent it from floating.
• When the tip of the rubber balloon is pulled upward, the internal volume increases and the pressure decreases. The air inside the bottle expands. Next, when the force of pulling on the rubber balloon is relaxed, the air inside it is compressed and the water around the bottle is sucked through the straw. The momentum at this time creates a fountain. This is the same principle as Water Fountain 4 (Cartesian Diver).
• This experimental video was produced with the support of JSPS Grant-in-Aid for Scientific Research 18K03956.

[Keywords]	Pressure, negative pressure
[Related items]	Water Fountain 4 (Cartesian Diver), Cartesian diver
[Reference]	Ryozo Ishiwata, "The Wonder of Flow," Kodansha Blue Backs, p. 34-37 Ryozo Ishiwata, "Illustrated Fluid Dynamics Trivia", Natsume Publishing, P14-15, P34-35

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