👉 A fluid, in the context of mechanics, is a substance that can flow and take the shape of its container, exhibiting both liquid-like and solid-like properties under different conditions. It has a definite volume but takes the form of its container, allowing it to flow smoothly and fill any space without losing its identity. This behavior is due to the relatively low intermolecular forces in fluids, which enable them to move past each other without significant resistance. Examples include water, oil, and air. The ability of fluids to flow and deform under pressure is fundamental in various applications, from hydraulic systems to atmospheric conditions.
