This video shows you a fun and popular demonstration of the power of sulfur hexafluoride. The gas makes a tinfoil boat float, seemingly on nothing. It's a reminder that the substance we think of as "thin air" can exert pressure. Which is why this gas might get injected into your eyeball.
Sulfur hexafluoride is a gas that's several times heavier than air. When you inhale it, it leads to the exact opposite of helium voice: a deep, rumbling vocalization that sounds suspiciously like a record on slow speed.
You've seen people suck up some helium and talk like a chipmunk at birthday parties, but now you can hear the opposite. This selfless science teacher inhales sulfur hexafluoride and treats us to the Oscar Mayer song.
Sulfur hexafluoride is one of the densest gases out there. It's so thick that it's possible to pour it into a container like a liquid and float a tinfoil boat on it. Check out the boat that floats on nothing.