👉 A fluid, in the context of physics and materials science, is a substance that flows easily and can change its shape without breaking. This characteristic is most prominently observed in liquids, which have a definite volume but take the shape of their container. Fluids exhibit properties like viscosity, allowing them to flow and resist deformation, yet they maintain a constant volume. This fluidity enables them to move from areas of higher pressure to lower pressure, and they can fill any space without leaving a trace. Examples include water, oil, and air, all of which demonstrate this unique ability to flow smoothly while retaining their volume.
