👉 A base fluid, also known as a carrier fluid, is the primary component in hydraulic systems that facilitates the transfer of energy through fluid pressure. It is typically a liquid, though sometimes gels or oils can serve this purpose, and it provides the medium through which hydraulic fluid (the working fluid) flows. The base fluid's primary roles include reducing friction between moving parts, dissipating heat, and carrying contaminants away from the system. Its viscosity and thermal properties are crucial for optimal performance, ensuring smooth operation and longevity of hydraulic components. Common base fluids include mineral oils, synthetic oils, and specialized fluids designed for specific applications like high-temperature or high-pressure environments.