Theoretical limit to the speed of sound

[rayma]

Fundamental research has found a theoretical limit to the speed of sound
in terms of fundamental constants, alpha, c, Mproton, and Melectron.
This limit is 36,100 m/s, about twice the speed of sound in diamond.
Speed of sound from fundamental physical constants | Science Advances

 

[Pano]

Solid hydrogen, figures it would have to be dense.
The sound at my house is rather lazy, loafing along at less than 343 m/s.

 

[U230421]

Hydrogen is a metal. To stir the sound up a bit in your house Pano, one could start by injecting it with the gas and then cool it down sufficient to under 4K.