👉 A characteristic fluid refers to a substance that exhibits properties of both liquids and gases, displaying characteristics such as viscosity (resistance to flow) and compressibility. Unlike liquids, which maintain a relatively constant volume and shape, and gases, which expand to fill any container, fluids can flow and change shape under certain conditions. For example, water is a fluid that flows and takes the shape of its container, while air, another fluid, can be compressed under pressure and expands when heated. This dual nature makes fluids versatile and essential in various natural processes and human applications, from the movement of water in rivers to the circulation of blood in our bodies.
