👉 The term "fluid" in this context refers to a substance that can flow or change shape easily, such as liquids. Unlike solids which have a fixed shape and volume, or gases which expand to fill any container, fluids maintain their composition but can move around and take the shape of their container. This property is due to the relatively weak intermolecular forces between fluid molecules, allowing them to slide past each other. Examples include water, oil, and air, which can flow, mix, and change volume without losing their identity as substances.
