👉 A fluid is a substance that flows easily, such as water or oil, and can change its shape to fill any space without losing its identity. This property is due to the lack of a fixed internal structure, allowing fluid molecules to move freely past each other. Fluids can be liquids, gases, or even plasmas, and their behavior is governed by principles like viscosity, which describes their resistance to flow. In everyday life, we observe fluids in various contexts, from the smooth flow of water in pipes to the movement of air around objects.
