👉 A "fluid" generally refers to a substance that exists in a liquid state, characterized by having no fixed shape but taking the form of its container. Liquids are composed of molecules that are close enough to interact with one another but are not tightly bound like in solids, allowing them to flow and change shape under certain conditions. Examples of fluids include water, oil, and blood. The term "fluid" also extends metaphorically to describe a state of continuous change or motion, as in "a fluid environment" or "fluid dynamics," which studies the behavior of fluids under various forces.
