91ԭƬ

Units and Conversions

The following tables of units and conversions are useful for reference. A PDF file of this information can be downloaded here.

1.1 Commonly used mechanical units

Heading 1 Heading 2 Heading 3 Heading 4
Cell 1 Cell 2 Cell 3 Cell 4
Long Cell Long Cell Long Cell Long Cell Long Cell  Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell 5 Cell 6

Cell 7

 Cell 8
Cell 9 Cell 10 Cell 11 Cell 12

1.2 Mechanical quantities, fundamental units of dimensions MLT (mass, length, time) and their SI units

Quantity
Dimensions
Units
Acceleration
³¢°Õ−2
Metre/second2
Angle
Radian
Angular acceleration
°Õ−2
Radian/second2
Angular momentum
²Ñ³¢2°Õ−1
Kilogram-metre2/second
Angular velocity
°Õ−1
Radian/second
Area
L2
Metre2
Energy
ML2°Õ−2
Joule
Force
M³¢°Õ−2
Newton
Frequency
°Õ−1
Cycle/second (Hertz)
Gravitational field strength
³¢°Õ−2
Newton/kilogram
Mass density
²Ñ³¢âˆ’3
Kilogram/metre2
Momentum
ML°Õ−1
Kilogram-metre/second
Power
²Ñ³¢2°Õ−3
Watt
Pressure
²Ñ³¢âˆ’1$°Õ°÷µ÷-2°¨$
Newton/metre2
Torque
ML2°Õ−2
Newton/metre
Velocity
L°Õ−1
Metre/second
Work
ML2°Õ−2
Joule

1.3 Multiples and sub-multiples of SI units

Prefix Symbol Equivalent
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deca da 10
deci d 10−1
centi c 10−2
milli m 10−3
micro μ 10−6
nano n 10−9
pico p 10−12
femto f 10−15
atto a 10−18

Additional Resources