Si Base Units
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1
2SI Base Units:
Physical quantity
Unit
Symbol
Length
meter
m
Mass, m
kilogram
kg
Time, t
second
s
Electric current, I
ampere
A
Temperature, T
kelvin
K
Amount of substance, n
mole
mol
Luminous intensity
candela
cd
Common Derived SI Units:
Physical quantity
Unit
Symbol
Definition
-1
Frequency, f or ν
hertz
Hz
s
2
-2
Energy , W or E
joule
J
kg m
s
-1
-2
Force, F
newton
N
J m
= kg m s
-2
-1
-2
Pressure, p
pascal
Pa
N m
= kg m
s
-1
Power, P
watt
W
J s
Electric charge, Q
coulomb
C
A s
-1
-1
Electric potential, U
volt
V
J A
s
-1
Electric resistance, R
ohm
Ω
V A
-1
Electric capacitance, C
farad
F
A s V
Magnetic flux
weber
Wb
V s
-1
Inductance
henry
H
V s A
-2
Magnetic flux density, B
tesla
T
V s m
-1
Radioactive activity
becquerel
Bq
s
-1
Absorbed dose
gray
Gy
J kg
-1
Dose equivalent
sievert
Sv
J kg
Prefixes
Prefix
Symbol
Multiply by
Prefix
Symbol
Multiply by
-18
2
atto
a
10
hecto
h
10
-15
3
femto
f
10
kilo
k
10
-12
6
pico
p
10
mega
M
10
-9
9
nano
n
10
giga
G
10
-6
12
micro
µ
10
tera
T
10
-3
15
milli
m
10
peta
P
10
-2
18
centi
c
10
exa
E
10
-1
deci
d
10
Temperature:
0 K = -273.15 °C; 0 °C = 273.15 K
Pressure:
5
1 atm = 760 Torr = 760 mmHg = 1.01325 bar = 101325 Pa; 1 bar = 10
Pa
Volume:
3
3
3
1 mL = 1 cm
; 1 L = 1000 cm
= 1 dm
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Parent category: Life