👉 In physics, a fluid can be understood as a substance that takes the shape of its container and flows easily. The two primary types of fluids are liquids and gases, distinguished by their behavior under different conditions. Liquids maintain a fixed volume but can change shape to fit their container, with molecules closely packed and moving in close proximity. Gases, on the other hand, have no fixed shape or volume; they expand to fill any container and have molecules that move rapidly and independently, often far apart. These differences in behavior are fundamental to understanding fluid dynamics and their applications in various fields, from meteorology to engineering.
