👉 In the context of physics, particularly in fluid dynamics, a "fluid" refers to a substance that exhibits both liquid-like and gas-like properties but is often characterized by its ability to flow and deform continuously under applied shear stress. Fluids can be found in various states, from gases like air to liquids such as water and oils, and even semi-liquid states like honey or molten lava. They are defined by their ability to take the shape of their container and move freely, without a fixed internal structure. This unique characteristic allows fluids to flow and fill any space they occupy, and they are governed by principles like viscosity (resistance to flow) and surface tension.
