👉 A fluid, in its simplest sense, is a substance that takes the shape of its container while maintaining a constant volume. Liquids exhibit this behavior, meaning they flow and change shape to fit their surroundings, yet they retain their chemical composition. Examples include water, oil, and air, which can be poured, stretched, or molded without losing their identity as liquids. This characteristic distinguishes fluids from solids and gases, which do not conform to the shape of their containers.
