👉 Fluid, in the context of biology and physics, refers to any substance that can flow or change shape without breaking into distinct particles. This includes liquids like water, blood, and oils, as well as gases such as oxygen and carbon dioxide. In biological systems, fluids like blood circulate through the body, transporting nutrients, oxygen, and waste products. In non-biological contexts, fluids can be found in various environments, from the atmosphere where water vapor exists as a gas to the oceans and lakes that cover much of the Earth's surface. Additionally, fluids are crucial in industrial processes, such as manufacturing and cooling systems, where they facilitate the transfer of heat and materials. The term "fluid" thus encapsulates a wide range of substances that exhibit fluid-like behavior, whether in nature or engineered systems.
