Linked from
The 10 pages that link to Hydraulic fluid, each with the reason it gives.
Pascal's lawRelated: Its near-incompressibility helps pressure changes pass through the system.
Hydraulic cylinderRelated: Its flow and compressibility influence cylinder response and efficiency.
Hydraulic motorRelated: Its properties affect motor lubrication, leakage, heat, and response.
Hydraulic excavatorRelated: Its pressure and flow carry power through the excavator’s circuits.
DashpotRelated: Its viscosity helps determine the force a hydraulic dashpot exerts at a given speed.