The King of Random - What Happens When You Mix Helium ...
The first is that it's about six times more dense than air which means that it's heavy for a balloon. The other thing that it's known for is having an opposite effect on your voice as helium. Instead of making your voice high, it makes your voice low. Pretty cool. We're gonna make a helium, sulfur hexafluoride cocktail. Okay, is it oh, okay.