Volume of Bubbles

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• Let’s use the principle of buoyancy to measure the volume of bubbles underwater.
• Place a container filled with water on the scale and reset the display to zero.
• Submerge the end of a straw into the water and blow air through it, creating bubbles. Observe the change on the scale.
• The displayed value corresponds to the total volume of the bubbles in cubic centimeters (cm³), including the submerged portion of the straw.
• To be precise, the water’s resistance slightly reduces the measurement, but this effect is minimal compared to buoyant force, so the scale reading provides a close approximation of the bubble volume.
• This video was produced with the support of the JSPS Grant-in-Aid for Scientific Research (18K03956).

[Keywords]	Buoyancy
[Related items]	Measuring Volume 1 (Archimedes’ Principle)
[References]	Ryozo Ishiwata and Mitsumasa Nemoto, “The Wonder of Flow,” Kodansha Bluebacks, pp. 48–51. Ryozo Ishiwata, “Illustrated Fluid Dynamics Trivia,” Natsume Publishing, pp. 188–189.

◀　Back Next　▶