I was watching an XKCD “What-If” video recently and Randal off-handedly mentions the title fact as a given. Upon a further Google search I see explanations about why sound moves faster in liquids than gasses but nothing for my specific question. Is there an intuitive explanation for that fact or is it just one of those weird observable facts with no clear explanation
Ahhh I in terms of fluid flow? I mean you can move a glass of water as fast as you want (don’t @ me physicists) if the glass is moving at that speed.
Little_mouse@lemmy.ca 21 hours ago
Sound is transferred through a medium literally as a wave. When you get right down to the core of it, the wave requires movement within the medium to transmit.
So it might help to conceptualize it not as “Liquid cannot move faster than the speed of sound in it’s medium” but more like “The speed of sound in a liquid medium is defined by the speed at which energy can propagate in that system, which includes motion.”
makeshiftreaper@lemmy.world 21 hours ago
So you’re saying I should view the speed of sound in a medium like the speed of light in a vacuum? That it’s the “speed-limit” of how a wave propagates and so trying to exceed it is impossible for a physical wave?
knightly@pawb.social 20 hours ago
Sort of. The speed of light in a vacuum is the speed of causality, nothing can go faster than the maximum speed at which one part of the universe can effect another.
It is possible for fluids to move faster than the speed of sound in the fluid around it, such as the exhaust products of a supersonic jet engine, but in these cases not all of the fluid is operating like a wave. The core of the jet experiences a laminar flow where all of the water is moving in the same direction and at roughly the same speed, like a laser instead of a flashlight. At the boundaries of this laminar flow exists a turbulent region where the fluid interacts with the surrounding medium and is slowed to subsonic speeds.
halcyoncmdr@lemmy.world 21 hours ago
Badically. “Liquid/fluid” and “gas” don’t necessarily mean the same thing scientifically as they do colloquially, they’re actually very close to the same thing.
Fluid dynamics covers the study of liquids, gasses, and plasmas because they’re effectively the same.
dohpaz42@lemmy.world 19 hours ago
So the medium is like a car made of liquid and the speed of sound is a passenger?
DontAskAboutUpdog@lemmy.world 11 hours ago
No, medium is the speed limit and the sound is a car that drives legaly.