# Speed of sound in different states

Consider a gas at very low temperature(lower than critical) and pressure . Upon increasing pressure it will transform to liquid state.

I know that speed of sound is independent of pressure, and also speed of sound is more in solids than in liquids than in gases.

So if I increase pressure of the gas will the velocity of sound increase or remains same in other state?

• Can you increase the pressure and still be at the triple point? I thought it was just that - a point - on the pressure vs. temperature graph. – M. Enns May 21 '16 at 16:35
• @M.Enns No. That is a mistake – user117954 May 21 '16 at 16:39
• @M.Enns Please have a look at edited question – user117954 May 21 '16 at 16:44
• $c=\sqrt\frac{K}{\rho}$ where density $\rho$ is weakly dependent on pressure. So it is incorrect to say that the speed of sound is independent on pressure. – Feyre May 21 '16 at 17:15
• The speed of sound directly depends upon pressure. See for instance http://physics.stackexchange.com/a/179057/59023. – honeste_vivere May 21 '16 at 18:12