Remove a ball from a deep location 1

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What type of experiment is this?

Experimental procedure and explanation:

• Let’s remove a ball from a deep tube with the wind from a hair dryer. A 5-cm-diameter polystyrene foam ball was prepared. The tube diameter (inner diameter) was 6.3 cm, and the depth was 50 cm.
• Even if the wind is blown with a hair dryer, it does not come out well. This is because the wind doesn't reach the bottom.
• Therefore, use a hose to ensure that the flow reaches the bottom. Then, the ball can be taken out. The principle is the same as "Removing a Ball from a Cylinder".

[Keywords]	Momentum theory, pressure
[Related items]	Removing a Ball from a Cylinder, Remove a ball or egg from the tube
[Reference]	“Illustrated Fluid Dynamics Trivia,” by Ryozo Ishiwata, Natsume Publishing, P200-201

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