👉 A fluid, in the context of physics and engineering, is a substance that takes the shape of its container while maintaining a constant volume. This means fluids neither expand nor contract significantly with changes in temperature or pressure, unlike gases which can change volume more dramatically. Common examples of fluids include water, oil, and air. The behavior of fluids is governed by principles like Pascal's Law, which states that pressure applied to a confined fluid is transmitted equally throughout the fluid and acts on all parts of the container's walls. This unique characteristic makes fluids essential in various applications, from hydraulic systems to biological circulatory processes.
