👉 A fluid, in the context of physics and materials science, is a substance that can flow or change shape without breaking into pieces. Unlike solids, which maintain a fixed shape and volume, and liquids, which have a definite volume but not a fixed shape, fluids exhibit properties of both. They can flow smoothly and adapt to their container's shape, yet they retain cohesive properties that allow them to cling together. This unique behavior is due to the intermolecular forces between fluid molecules, which are weaker than those in solids but stronger than in gases, enabling the fluid to move and change shape while still maintaining a continuous substance.
