附件242 Chapter2 Fundamental Hydranlic Fluid Mechanics 2.2.2 The basic formula of hydrostatics 1.The basic formula of hydrostatics The acting pressures on the fluid at rest,in a container include the weight,force on the fluid surface,shown in Fig 2-4a The total balance force formula is pA4p,△d+Pgh△429 A mula (2-9)divide by then (2-10 a b p=P。+pgh Fig.2-4 The distribution of forces in a container with rest fluid 国Chapter2 Fundamental历dranlie Fid Mechanies年 The formula (2-10)is the basic equation for hydrostatic.It states that the distribution status of hydrostatics as following: (1)The pressure on a rest fluid coutained involves two parts: P=P。+8h (2-11) (2)The pressure with the depthh (3)Isotonic pressure surface,that is,the pressures are all equal at the surface consisted by all points at given depth h.such as at the line ofA (4)Conservation of energy +h=P+h=constant (2-12) pg Here.the Popg as pressure energy at per uit mass fluid.附件 24.2 13