Alka-Seltzer added to spherical water drop in microgravity

(March 22, 2003) —- Expedition Six NASA ISS Science Officer Don Pettit performs a series of microgravity experiments with water spheres and effervescent antacid tablets. In the second of four videos, Pettit inserts a tablet into a 50-millimeter sphere and observes the fizzy results.

(Source: youtube.com)