👉 A fluid, in the context of fluid dynamics and often used in engineering and physics, is a substance that can flow and change shape without breaking into smaller pieces. It includes liquids and gases, which are characterized by their ability to move and take the shape of their container while maintaining a constant volume. The key properties of fluids are their compressibility; they can be compressed under pressure, and they have no internal friction, allowing them to flow smoothly. These characteristics make fluids essential for various natural processes and technological applications, from the circulation of blood in our bodies to the operation of hydraulic systems.
