👉 Fluid, in the context of physics and chemistry, refers to a state of matter that exhibits properties of both liquids and gases. Unlike rigid liquids, fluids flow and change shape with the application of external forces, a characteristic known as viscosity. They also have the ability to fill any container they are placed in, demonstrating compressibility, unlike gases which can be compressed. Examples of fluids include water, blood, and air. The term "fluid" can also describe any material that can flow or deform continuously under applied stress, such as molten metals or polymers.
