If you make a hole in the middle of a straw

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• If you make a hole in the middle of a straw, what happens to the liquid inside it (ink was used to make it easier to see)?
  Choose the answer from the following three.
  ① All the fluid flows out
  ② Liquid above the hole flows out
  ③ Liquid below the hole flows out

[Keywords]	Depth and pressure, surface tension
[Related items]	Scoop liquid with a straw, Plastic Bottle with Holes
[Reference]	The Wonders of Flow,” Japan Society of Mechanical Engineering, Kodansha Blue Backs, P38-41. “Illustrated Fluid Dynamics Trivia,” by Ryozo Ishiwata, Natsume Publishing, P18-19.

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