👉 Fluid, in the context of physics and engineering, refers to a substance that flows or moves freely without resistance, exhibiting properties of both liquids and gases. The key principles of fluid behavior include incompressibility (the volume of a fluid remains constant under pressure) and viscosity (a measure of a fluid's resistance to flow). Fluids adhere to the principles of conservation of mass and momentum, meaning their total mass remains constant within a closed system, and their motion is governed by forces like pressure gradients, surface tension, and external forces. These principles explain phenomena such as fluid flow through pipes, the movement of ocean currents, and the behavior of gases in various conditions.
