Fluid Mechanics  Imperial and SI Units vs. Dimensions
Imperial (USCS) and SI dimensions and units terminology in fluid mechanics.
Fluid mechanics in the
 Imperial or USCS  United States Customary Units
 International System of Units  SI system
Terminology  Dimensions  Imperial Units (USCS)  SIunits 

Acceleration due to gravity  L / T^{2}  ft/s^{2}  m/s^{2} 
Area  L^{2}  ft^{2}  m^{2} 
Chezy roughness coefficient  L^{1/2 }/ T  ft^{1/2}/s  m^{1/2}/s 
Critical Depth  L  ft  m 
Density  F T^{2 }/ L^{4}  lb s^{2}/ ft^{4}^{ }  N s^{2}/m^{4} 
Depth  L  ft  m 
Depth in open channel  L  ft  m 
Diameter  L  ft  m 
Distance from solid boundary  L  ft  m 
Flow rate  L^{3 }/ T  ft^{3}/s  m^{3}/s 
Force  F  lb  N 
Force due to pressure  F  lb  N 
Hazen Williams roughness coefficient  L^{0.37 }/ T  ft^{0.37}/s  m^{0.37}/s 
Head loss due to friction  L  ft  m 
Head of height  L  ft  m 
Head of weir  L  ft  m 
Height above datum  L  ft  m 
Hydraulic radius  L  ft  m 
Kinematic viscosity  L^{2 }/ T  ft^{2}/s  m^{2}/s 
Length  L  ft  m 
Manning's roughness coefficient  T / L^{1/3}  s/ft^{1/3}  s/m^{1/3} 
Mass  F T^{2 }/ L  lb s^{2}/ft  N s^{2}/m 
Modulus of elasticity  F / L^{2}  lb/in^{2} (psi)  Pa 
Perimeter, Weir Height  L  ft  m 
Pressure  F / L^{2}  lb/ft^{2}  Pa 
Radius  L  ft  m 
Shear stress  F / L^{2}  lb/ft^{2}  Pa 
Size of roughness  L  ft  m 
Specific weight  F / L^{3}  lb/ft^{3}  kg/m^{3} 
Surface tension  F / L  lb/ft  kg/m 
Time  T  s  s 
Thickness  L  ft  m 
Time  T  s  s 
Total head  L  ft  m 
Unit flow rate  L^{3 }/ T L  ft^{3}/(s ft)  m^{3}/(s ft) 
Velocity  L / T  ft/s  m/s 
Viscosity  F T / L^{2}  lb s/ft  Pa s 
Weight  F  lbf  N 
 L  length
 F  force
 T  time
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Fluid Mechanics
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