👉 A fluid, in the context of science and biology, generally refers to a substance that takes the shape of its container while maintaining a constant volume. This distinguishes fluids from solids and gases, which do not conform to the shape of their container but maintain a fixed volume. Examples of fluids include water, blood, and oil. Unlike solids, fluids can flow and change shape to fill any space, and unlike gases, they have a definite volume but not a definite shape, taking the form of their container. This unique property makes fluids essential for various biological and physical processes, from nutrient transport in blood to the movement of substances within cells.
