The kinematic viscosity indicates whether a hydraulic fluid is thin or viscous at a certain temperature, and therefore whether the friction between the fluid layers is lower or higher. This also has an impact on pressure loss in hydraulic systems, for example.
Relationship between the dynamic viscosity and a fluid's density:
In hydraulics kinematic viscosity is the usual parameter for viscosity. This parameter changes with the temperature of the hydraulic fluid.
ν was previously given in degrees Engler (°E), and then in stokes or centistokes (cSt), but is now given in m2/s or mm2/s. cSt can be converted as follows:
1 cSt = 1 mm2/s