alt Hacker NewsAnyone know the physics of mach diamonds purely from compressed gas? I'm not a physicist, but I thought one of the key aspects of compressed gas is that it can't expand faster than the speed of sound in that gas -- the speed of sound is literally the limit to how fast it can expand?
Gas expanding faster than the speed of sound is called a shockwave - and the Mach diamonds are essentially the expanding gas shockwave “bouncing” back and forth as it hits the atmosphere, forming a standing wave of high and low compression zones.