👉 A fluid is a state of matter characterized by its ability to flow and change shape while maintaining a constant volume. At the molecular level, fluids consist of particles that are closely packed but not rigidly arranged, allowing them to move past one another when subjected to an external force like pressure or shear stress. This movement results in the fluid's ability to flow smoothly and adapt its shape to fill any container, a property known as viscosity. Common examples of fluids include liquids like water and oils, and gases such as 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 in all directions throughout the fluid.
