Sound waves carrying mass and how to measure it

[itallcomestoenergy]

I don't know in which category this subject belongs to. Anyways, here it is:

https://www.sciencealert.com/a-new-...PVn03f4UxVQ8adcK4Il3A_N7bUbJT1KaGR1ZfCbGuWVLE
How exactly is this measured? Can we expect to get other results in total darkness?

 

[anorlunda]

Isn't that implicit in the concept of invariant mass?
https://en.wikipedia.org/wiki/Invariant_mass

 

[itallcomestoenergy]

Isn't that implicit in the concept of invariant mass?
https://en.wikipedia.org/wiki/Invariant_mass

ESL. If photons only carrying particles without mass, then how does the energy-transferring-process work at this point?

 

[anorlunda]

ESL. If photons only carrying particles without mass, then how does the energy-transferring-process work at this point?

Nobody mentioned photons.

Energy gravitates. Kinetic energy gravitates. Sound energy is a form of kinetic energy.

The Wikipedia article explains it better than I can.