Re: Technical Question
What is the speed of sound in a "near vacuum"?
Oddly enough, it doesn't change much...
"For a given ideal gas with constant heat capacity and composition, the speed of sound is dependent solely upon temperature; see Details below. In such an ideal case, the effects of decreased density and decreased pressure of altitude cancel each other out, save for the residual effect of temperature."
https://en.wikipedia.org/wiki/Speed_of_sound