Most Important Units from Fluid Mechanics

Most Important Units from Fluid Mechanics

➽ Mass=kg

➽ Weight/Force=N=kg-m/s2

➽ Mass density-=kg/m3

➽ Weight density/Unit weight/specific weight=N/m3

➽ Specific gravity/Relative density=No unit

➽ Specific volume=m3/kg

➽ Velocity gradient/Rate of shear strain= per sec

➽ Shear stress= N/m2

➽ Dynamic viscosity/Coefficient of viscosity
⇰ SI unit=N-sec/m2=Pa-sec=kg/m-sec
⇰ CGS unit= dyne-sec/cm2 =gm/cm-sec =1Poise =0.1N-sec/m2

➽ Kinematic Viscosity
⇰ SI unit= m2/sec
⇰ CGS unit= cm2/sec= 1 stokes


➽ Bulk modulus= N/m2

➽ Compressibility= m2/N

➽ Surface tension/ Surface energy= N/m=J/m2

➽ Capillary rise/fall=m

➽ Pressure= N/m2

➽ Pressure head=m

➽ Total pressure/ Hydrostatic force/ Total pressure force =N

➽ Centre of pressure= m

➽ Metacentric height= m

➽ Mass flow rate=kg/sec

➽ Volume flow rate/discharge= m3/sec

➽ Pressure head/ velocity head/ datum head= m

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