👉 Fluid, in both its liquid and gaseous states, is a substance characterized by its ability to flow and change shape while maintaining its chemical identity. Unlike gases, which are highly compressible and spread out to fill any container, fluids take the shape of their container but retain a constant volume. Liquids have a definite volume, while gases have neither a fixed volume nor shape. Examples of fluids include water, oil, and air, each exhibiting unique properties based on their molecular structure and intermolecular forces. This characteristic of fluidity is fundamental to understanding many natural phenomena and engineering applications, from the movement of water in rivers to the operation of hydraulic systems.
