-
In scientific terms, it was akin to rolling a steel ball down an inclined plane to measure its velocity only to watch the ball float into the air instead.
WSJ: 'Drive' Excerpt by Daniel H. Pink
-
The geometry of nozzle causes the air to reach supersonic speeds and, as a result, the gun achieved a muzzle velocity of 406 meters per second, which is about Mach 1.23!
FORBES: The Supersonic Ping-Pong Gun
-
When water velocity is high, the pressure within the liquid drops to below the vapour pressure of water, allowing tiny air bubbles to expand.
BBC: Shrimp, bubble and pop