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Till now we were discussing the various concepts and equations such as continuity equation our discussion about the compressible fluid flow with the derivation of expression for velocity of sound in an isothermal process.  Before understanding the process to derive the expression for velocity of sound in isothermal process, we must have to study our previous post which shows the derivation of velocity of sound wave in a fluid and velocity of sound in terms of bulk modulus.  For an isothermal process, temperature must be constant.  As we know the following equation, as mentioned here, we will use this equation to derive the velocity of sound in an isothermal As we are discussing here the case of an isothermal process and therefore the term RT will be constant and hence we can write the Let us differentiate the above equation and we will have following equation as mentioned here.  We will now divide the above equation with ρ-1 and we will have  Therefore we will have following equation, as mentioned here, which shows the expression for velocity of sound in isothermal process.  Further we will go ahead to find out the velocity of sound in an adiabatic process, in the subject of fluid mechanics, with the help of Do you have any suggestions? Please write in comment box.  Fluid mechanics, By R. K. Bansal  Image courtesy: Google  Till now we were discussing the various concepts and equations such as continuity equation discussion about the compressible fluid flow with the derivation of expression for velocity of sound in terms of bulk modulus.  EXPRESSION FOR VELOCITY OF SOUND IN TERMS OF BULK MODULUS  Before understanding the process to derive the expression for velocity of sound in terms of bulk modulus, we must have to study our previous post which shows the derivation of velocity of sound wave in As we are interested here to find the expression for velocity of sound in terms of bulk modulus, therefore let us brief here first the