👉 A covered fluid, often referred to as a hydraulic fluid or oil in mechanical contexts, is a lubricant and heat transfer medium used in various machinery and hydraulic systems. It is typically a viscous liquid or semi-liquid substance that fills the spaces between moving parts, reducing friction and wear while also dissipating heat generated during operation. This fluid is crucial in hydraulic systems, where it enables the transmission of force and power through pressurized fluid flow, allowing for precise control and efficient operation of actuators, brakes, and other mechanical components. Common types include mineral oil, synthetic oils, and greases, each chosen based on specific application requirements such as temperature resistance, viscosity, and chemical stability.
