👉 Lubricants are substances that aid in the flow of fluids within an object. They provide a layer or coating on the surface to prevent friction and thus, help to maintain smooth operation and reduce wear and tear. Examples of lubricants include oils, grease, and gasses (such as nitrogen or argon) that coat the surfaces of components for better adhesion and durability. These substances are typically used in various types of machinery, including engines, motors, pumps, and hydraulic systems.