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SI Base Units
Quantity Unit Symbol Unit Name
Length m meter
Mass kg kilogram
Time s second
Electric current A Ampere
Temperature K Kelvin
Luminous intensity cd candela


Decimal Multiples And Sub-Multiples
Factor Prefix Symbol
1012 tera T
109 giga G
106 mega M
103 kilo k
102 hecto h
10 deca da
10-1 deci d
10-2 centi c
10-3 milli m
10-6 micro µ
10-9 nano n
10-12 pico p
10-15 femto f
10-18 atto a


Geometrical
Symbol Quantity Symbol Unit Name
l,s length, distance m meter
A area m2 square meter
V volume m3 cubic meter
a, , ?, etc. plane angle rad radian
    ° degree
a, , ?, etc. solid angle   steradian


Time-Related
Symbol Quantity Unit Symbol Unit name
t time s second
t time constant s second
u,v velocity ms-1 meter per second
a acceleration ms-2 meter per second per second
? angular velocity rad s-1 radian per second
a angular acceleration rad s-2 radian per second per second
f frequency Hz Hertz
n rotational frequency s-1 (revolution) per second


Mechanical
Symbol Quantity Unit Symbol Unit name
m mass kg kilogram
F force N Newton
G (W) weight N Newton
J moment of inertia kgm2 kilogram meter squared
M (T) torque kgm kilogram meter
W (E) work (energy) J Joule
P power W Watt
p pressure Pa Pascal
E modulus of elasticity Pa Pascal
s stress Pa Pascal
? density kgm-3 kilogram per cubic meter
dx rate of flow m3s-1 cubic meter per second
k, k1, etc. any constant factor    
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