👉 Tube fluid, also known as lubricating oil or grease, is a specialized fluid used to reduce friction and wear between moving parts within a tube or conduit system. It is typically a viscous liquid or semi-solid substance that flows through the tube's internal passageways, providing a protective layer that minimizes direct contact between surfaces. This fluid is essential in various applications, such as industrial machinery, HVAC systems, and plumbing, where it ensures smooth operation, extends component life, and prevents overheating. Tube fluid can be composed of mineral oils, silicone oils, or synthetic lubricants, each tailored to specific temperature and pressure conditions to maintain optimal performance.