84) A flow through a long pipe at constant rate is called

85) The volume per unit mass of a liquid is called specific volume.

86) In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.

87) In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

88) Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.