👉 Ordinary fluids, also known as liquids, are substances that have a definite volume but take the shape of their container. Unlike gases, which expand to fill any space available, liquids maintain a constant volume but can flow and change shape when subjected to forces like gravity or pressure. Common examples include water, oil, and blood. These fluids are characterized by their viscosity, which is a measure of their resistance to flow, and they can exhibit surface tension due to cohesive forces between molecules. Ordinary fluids are essential in various natural and industrial processes, from the movement of water in rivers to the operation of engines and hydraulic systems.
