👉 A fluid, in the context of physics and chemistry, is a substance that takes the shape of its container while maintaining a constant volume. This means that fluids, such as water, oil, or air, can flow and change shape to fit their surroundings but never expand or contract in volume. They exhibit properties like viscosity, which describes their resistance to flow, and surface tension, which allows them to form droplets or maintain certain shapes on their own. Fluids are essential in numerous natural and industrial processes, from the movement of water in rivers to the operation of engines and cooling systems in machinery.
