[gmx-users] speed of sound in liquid

[Elisabeth]

Dear all,

Does anyone know how to obtain speed of sound, c,  in a liquid? c is
defined as square root of dP/drho (pressure change with density) at
constant entropy

 My idea is to run a series of NPT simulations to obtain density at each P,
to get dP/drho. However, I am not sure how to ensure a constant entropy in
the system...

Could anyone comment on this?

Thanks a lot in advance,
E.