👉 A fluid, in the context of technical and scientific discussions, typically refers to a substance that can flow easily and smoothly without resistance. This category includes liquids and gases, both of which have unique properties that make them ideal for various applications. Liquids, such as water or oil, maintain a definite volume but take the shape of their container, while gases, like air or nitrogen, have no fixed volume and expand to fill any space available. The required fluid in a given context often depends on the specific application, but generally, it is essential for processes involving heat transfer, lubrication, or as a medium for chemical reactions. Understanding the properties and behaviors of fluids is crucial in fields like engineering, chemistry, and environmental science.
