Chapter 2 Fundamental Hydraulic Fluid Mechanics 2.1.1 The Main performances 1.Density (kg/m3) (2-1) 2.Compressibility the coefficient of compressibility k,k is the bulk modulus of elasticity (2-2) △V K is defined as the ratio of the change in pressure (Ap )to relative change in volume (while the temperature remains constant 3 Homepage List Upwards Downwards Retumn ExitChapter 2 Fundamental Hydraulic Fluid Mechanics 3 1. Density (kg/m3 ) 2. Compressibility 2.1.1 The Main performances V V p k K   = = − 1 the coefficient of compressibility , is the bulk modulus of elasticity (2-2) (2-1) k is defined as the ratio of the change in pressure ( ) to relative change in volume ( ) while the temperature remains constant. V V  p m V  = k K