👉 Fluid, in the context of fluid dynamics and thermodynamics, refers to a state of matter that exhibits properties intermediate between those of liquids and gases. It has a definite volume but takes the shape of its container, unlike gases which have neither a fixed volume nor shape. Fluids flow easily and can move from areas of higher pressure to lower pressure, demonstrating characteristics like viscosity (resistance to flow) and surface tension. This state is crucial in many natural phenomena and engineering applications, from the movement of water in rivers to the operation of hydraulic systems.
