👉 A fluid, in the context of physics and materials science, is a substance that flows easily and can take the shape of its container, exhibiting characteristics of both liquids and gases. Unlike solids, which have a fixed shape and volume, and gases, which expand to fill any container, fluids maintain a constant density and can flow from areas of higher pressure to lower pressure. This behavior is due to the intermolecular forces within fluids, which allow them to move and rearrange themselves while still maintaining a cohesive structure. Examples include water, air, and oils, each demonstrating unique properties of fluidity that make them essential in various natural and industrial processes.
