Chapter 2 Fundamental Hydraulic Fluid Mechanics There are three methods to describe the viscosity: absolute viscosity,Kinematic viscosity and relative viscosity. (1)Dynamic viscosity or absolute viscosity (Pa-s)or (N-s/m2) dy (2)Kinematic viscosity v(mm2/s) p (2-4) (3)Relative viscosity (conditional viscosity) The relative viscosityowhich used in China is tested by theE viscometer,such as Fig.2-2 5 Homepage List Upwards Downwards Retumn ExitChapter 2 Fundamental Hydraulic Fluid Mechanics 5 There are three methods to describe the viscosity: absolute viscosity, Kinematic viscosity and relative viscosity. (1) Dynamic viscosity or absolute viscosity μ(Pa•s) or (N •s/m2 ) (2) Kinematic viscosity ν(mm2 /s)    = d ( ) d u y   = (2-4) (3) Relative viscosity (conditional viscosity) The relative viscosity which used in China is tested by the viscometer, such as Fig.2-2. E E