What is the speed of sound of plasma gas?

Question

Speed of sound of air ~ 330m/s, and im curious about the speed of sound in plasma state. Already searched but found nothing, does anyone know?

Answer 1

My God. There is a whole discipline within physics called plasma physics (which is pursued typically at advanced postgraduate level) which deals with questions such as this. In fact, the speed of sound in plasmas is a very important value which impinges in great detail on their behaviour. For instance, the behaviour of large conglomerations of celestial matter depends very strongly on the speed of sound, and the so-called Jeans length is a fundamental constraint on how small a locally inhomogenous concentration of matter in the universe can be and still contract gravitationally to form, for example, a star cluster. The speed of sound in plasmas can be many times the value with which we are familiar.

But forget just plasmas. In sufficiently dense media the speed of sound can approach the speed of light, in which case a whole menagerie of nasty relativistic creatures crawl out of the woodwork (keywords here: electron degeneracy pressure, Chandrashekar limit, Pauli exclusion principle)

Here's a freebie: (dp/d rho)^1/2 is the adiabatic velocity of sound in a gas (that's straight out of hydrodynamics).

Answer 2

Most likely we can hear sound if we are inside the medium that carries the sound. Air is such a medium. Plasma is a gasous state also but it is at a much higher temperarure than air. The Human ear has a limit to temperature.
However you could calculate the speed in such a medium using a basic sound enery Unit called "Phonon."
See the theory on Phonons.

Answer 3

I venture to say, Plasmoid Experiments have noted hum.
253.58 hz, 257.2295 hz, -4.16, -364, in a Full Vacum @ 1.72 X 10^-6 Torr. ( in a cryogenic vacum system, simulating space of course. )
Maybe you can pull what you need from that. :)

Answer 4

no.......of course