👉 Fluid, in the context of biology and physics, refers to substances that flow easily and change shape to fill their container. This includes liquids like water, blood, and various organic compounds such as oils and fats. Fluids exhibit properties like viscosity, which describes their resistance to flow; for instance, honey is highly viscous, while water flows more freely. They are essential for life, enabling processes like nutrient transport in blood, lubrication of joints, and the regulation of body temperature. Fluids can also exist in different states under varying conditions of temperature and pressure, transitioning between solid (ice), liquid (water), and gas (steam) states. Understanding fluid dynamics is crucial in fields ranging from medicine to engineering, influencing everything from the design of pipelines to the study of weather patterns.
