👉 Fluid, in the context of fluid dynamics, refers to a substance like liquids or gases that can flow and deform continuously under applied shear stress. The speed of fluid movement, known as fluid velocity, varies depending on factors such as the fluid's density, viscosity, and the forces acting upon it. In general, fluids move faster in narrower passages due to the principle of continuity, where the velocity increases as the cross-sectional area decreases. This phenomenon is described by Bernoulli's principle, which states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or potential energy. Thus, understanding fluid velocity is crucial for applications ranging from aerodynamics to hydraulic systems.
