21. Note this is valid only for one dimensional fluid flow in rectangular coordinates. 22. A few channels on Mars displayed inner channels that suggest sustained fluid flows . 23. An increase in temperature increases the wettability of the surface, promoting fluid flow . 24. The wording went from a smooth, fluid flow into a jagged, broken mix. 25. The continuity equation applies the principle of conservation of mass to fluid flow . 26. The cerebrospinal fluid flows between the second and the third one. 27. Turbulence is the time-dependent chaotic behavior seen in many fluid flows . 28. Thus overestimating the tendency for particles to depart from the fluid flow direction. 29. Rather it is a fixed frame or control volume that fluid flows through. 30. The Navier Stokes equations govern the velocity and pressure of a fluid flow .