Volume of an Inflated Balloon

Let's take a look!

What type of experiment is this?

Experimental procedure and explanation:

• Use the principle of buoyancy to measure the volume of a balloon submerged in water.
• Place a container filled with water on the scale and reset the display to zero.
• Submerge a balloon (with a straw attached) fully underwater. Inflate or deflate the balloon while it is submerged. The scale reading will change accordingly.
• When submerging the balloon, ensure it does not touch the bottom or float above the surface, and that no air bubbles cling to it.
• When the balloon inflates, the displayed value (volume in water, cm³) increases; when deflated, it decreases. This reading represents the balloon’s volume (cm³), including the submerged portion of the straw.
• 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　▶