👉 Fluid, in the context of physics and engineering, refers to a substance that can flow and take the shape of its container. This includes liquids, which are composed of molecules held together by intermolecular forces that allow them to move past each other but not easily disperse. Unlike gases, which have much higher kinetic energy and can spread out to fill any container, fluids maintain a definite volume but can change shape to conform to the boundaries of their container. Examples of fluids include water, oil, and mercury.
