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depends :

Newton-Laplace equation

cs= (G/rho)^0.5

cl = ((E(1-v))/(rho(1+v)*(1-2v)))^0.5

for gases:

c = (gama*R*T/M)^0.5

where c = speed of sound

cs = shear speed of sound

cl = longitudinal speed of sound

G = coefficient of stiffness (bulk modulus for gases)

E = modulus of elasticity

v = poissons ratio

rho = density of the material

gama = adiabatic index 91.4 for most diatomic gases at room temperature)

R = molar gas constant

T = temperature

M= molar mass

so for say Aluminum

G = 3.8*10^6 psi

E = 9.9*10^6 psi

v = 0.3

rho = 0.098 lb/in^3

cs = 6227 in/s

cl = 11661 in/s

so in Mph:

cs = 354 mph

cl = 622 mph

aluminum is a fairly soft solid so the speed of sound is low but the stiffer the material the faster the speed of sound

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