👉 Fluid, in the context of physics and materials science, refers to a substance that can flow or deform under stress without breaking. This characteristic is most commonly observed in liquids and some gases, but can also be found in certain solids known as viscoelastic materials. Unlike rigid solids, fluids adapt to the shape of their container and can move past one another, allowing them to fill irregular spaces. This property is crucial in various natural phenomena and technological applications, from the movement of ocean waves to the functioning of hydraulic systems. The fluid behavior is governed by principles such as viscosity, which describes a fluid's resistance to flow, and can be influenced by factors like temperature and pressure.
