👉 Fluid, in the context of physics and engineering, refers to substances that flow or move freely without a fixed shape, such as liquids. A key characteristic of fluids is their ability to take the shape of their container while maintaining a constant volume, which means they neither compress nor expand under pressure. Examples include water, oil, and air. Fluids exhibit both liquid-like properties (cohesion, surface tension) and gas-like properties (ability to flow). The behavior of fluids is governed by principles like Pascal's Law, which states that pressure applied to a confined fluid is transmitted equally in all directions, and Bernoulli's principle, which relates fluid speed to pressure and height. Understanding fluid dynamics is crucial in various applications, from designing pipelines and engines to studying weather patterns and ocean currents.
