👉 A fluid in physics, particularly in the context of fluid dynamics, is a substance that flows easily and smoothly without breaking into droplets or forming distinct layers. This characteristic is due to the low viscosity of the fluid, which means it has a relatively low resistance to flow. Examples include water and air, where the molecules are loosely bound and can move freely past one another. Fluids can take the shape of their container, but they generally resist deformation due to their fluidity. This behavior is crucial in understanding various natural phenomena, from ocean currents and weather patterns to the flow of blood in biological systems.
