Fluid dynamics is a branch of physics concerned with the mechanical properties of fluids (both liquids and gases) when they are in motion. It studies how forces affect the flow of these materials, examining concepts such as shear stress, pressure differentials, and viscous forces. The behavior of a fluid is governed by fundamental principles, including the conservation of mass and the conservation of momentum. Key phenomena studied include the transition between smooth, orderly flow (laminar flow) and chaotic, disordered flow (turbulent flow). The field has extensive applications across engineering and natural sciences, providing the theoretical basis for understanding aerodynamics, the efficiency of pumping systems (hydraulics), and the movement of air and water in atmospheric and oceanic systems.