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Quantity |
SI |
USCS |
||
Symbol |
Unit |
Symbol |
Unit |
|
Acceleration,
angular |
|
rad/s2 |
|
rad/s2 |
Acceleration, linear |
|
m/s2 |
|
ft/s2 |
Area |
|
m2 |
|
ft2 |
Density (mass) |
|
kg/m3 |
|
slug/ft3 |
Energy |
J |
N·m |
|
ft-lb |
Force |
N |
kg·m/s2 |
lb |
lb |
Frequency |
Hz |
s-1 |
Hz |
s-1 |
Impulse, angular |
|
N·m·s |
|
ft-lb-s |
Impulse,
Linear |
|
N·s |
|
lb-s |
Intensity of Force |
|
N/m |
|
lb/ft |
Length |
m |
m |
ft |
ft |
Mass |
kg |
kg |
|
lb-s2/ft |
Moment
of a force; torque |
|
N·m |
|
ft-lb |
Moment of inertia
(mass) |
|
kg·m2 |
|
slug-ft2 |
Geometrical
moment of inertia |
|
m4 |
|
in.4 |
Power |
W |
J/s |
|
ft-lb/s |
Pressure |
Pa |
N/m2 |
psf |
lb/ft2 |
Section modulus |
|
m3 |
|
in.3 |
Specific
weight (weight density) |
|
N/m3 |
pcf |
lb/ft3 |
Stress |
Pa |
N/m2 |
psi |
lb/in.2 |
Time |
s |
s |
s |
s |
Velocity, angular |
|
rad/s |
|
rad/s |
Velocity,
linear |
|
m/s |
fps |
ft/s |
Volume (liquids) |
L |
10-3m3 |
gal. |
231 in3 |
Volume
(solids) |
|
m3 |
cf |
ft3 |
Work |
J |
N·m |
|
ft-lb |
SI : International System , USCS : U.S. Customary System |