Season 1, Episode 3

Why Does Breathing Helium Make Your Voice So High?

Air Date: 1999-09-26

Overview: The discovery of how the density of several elements affects sound, what is needed for sound to be present, and how sound works. The pitch of a person's voice compared to that of a musical instrument is discussed, along with how changing the speed of sound affects the pitch of the voice, and how the pitch can be changed.

Runtime: 30 minutes