👉 A fluid, in this context, refers to a substance that takes the shape of its container while maintaining a constant volume and density. It flows or moves easily under the influence of external forces, such as gravity or pressure, but its composition remains relatively stable and uniform. Examples include liquids like water, oil, and mercury. Unlike gases, which expand to fill any container regardless of its shape, fluids maintain their form and resist compression. This unique property makes them essential in various natural processes and human applications, from lubrication and transportation to biological functions.
