👉 A fluid is a substance that takes the shape of its container while maintaining a constant volume. Unlike gases, which expand to fill any space they occupy, fluids resist changes in volume and tend to flow from areas of higher pressure to lower pressure. This behavior is due to the cohesive forces between fluid molecules and their ability to move past each other, making fluids essential in many natural processes, from the movement of water in plants to the circulation of blood in our bodies.
