Helium is the gas that makes your voice high when you inhale it. It causes your voice to go high pitch like Alvin and the chipmunks in all of their chipmunk covers. Of course, there needs to be a gas that gives the opposite effect. But, this one is a lot less cute. It’s actually a tiny bit terrifying. Sulfur hexafluoride is the gas that makes your voice high when you inhale it. Both of these gases affect your voice because they are a different density than the rest of the air, thus sound travels through it differently. Continue reading Going Very High and Very Low with Helium and Sulfur Hexafluoride