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Published On: Fri, Aug 26th, 2011

SI Base Units-SI units and prefixes

SI Base Units
Quantity
Unit
Symbol
Length
meter
m
Mass
kilogram
kg
Time
second
s
Temperature
kelvin
K
Amount of Substance
mole
mol
Electric current
ampere
A
Luminous intensity
candela
cd
SI Derived Units
Quantity
Unit
Symbol
Area
Length squared
m2
Volume
Length cubed
m3
Density
Mass per cubic volume
kg/m3
Speed
Distance traveled per unit time
m/s
Acceleration
Speed changed per unit time
m/s2
Force
Mass time acceleration of object
kg . m/s2
Pressure
Force per unit area
kg/(m.s2)
Energy
Force times distance traveled
kg.m2/s2
SI Prefixes
Multiple
Prefix
Symbol
1018
exa
E
1015
peta
P
1012
tera
T
109
giga
G
106
mega
M
103
kilo
k
102
hecto
h
10
deka
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

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