Full-fledged turbulence breaks out when gases with different densities move at a high speed relative to each other. In this case, one gas is 2.5 times denser than the other, and when they move at 380 miles per hour relative to each other, they become turbulent.

"Beyond a certain velocity, all things fluid get unstable--they will fluctuate and become turbulent," says Danesh Tafti, an associate professor of mechanical engineering at Virginia Tech.