Hello, I don't know if this question belonged here or in General Physics, so I apologize if I made a mistake. My question is simple, what are the Navier-Stokes Equations for a Compressible Fluid? I don't mean from a conceptual point of view, what I mean are the mathematical equations themselves. I've been looking left and right on the internet to find them, but every website gives them in different forms and I don't know which website is correct, or if all of them are correct but simply written differently. Thank you for any help.