SI Units

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home · Chemistry · SI Units


SI Units

SI = Système International d'unités

  1. Quantity, Name, Symbol
  2. SI Prefixes
  3. SI Derived Units
  4. cgs Units

Quantity, Name, Symbol

metre (meter): m
(the correct English spelling of the unit is "metre", but the variant "meter" is frequently used in the United States)
kilogram: kg
second: s
electric current
ampere: A
thermodynamic temperature
kelvin: K
amount of substance
mole: mol
luminous intensity
candela: cd

SI Prefixes

exponent (base 10) of decimal numbers: E n = 10n

Factor           Prefix   Symbol

1024     E 24     yotta    Y
1021     E 21     zetta    Z
1018     E 18     exa      E
1015     E 15     peta     P
1012     E 12     tera     T
109      E  9     giga     G
106      E  6     mega     M
103      E  3     kilo     k
102      E  2     hecto    h
101      E  1     deca     da
10-1     E -1     deci     d
10-2     E -2     centi    c
10-3     E -3     milli    m
10-6     E -6     micro    µ
10-9     E -9     nano     n
10-12    E-12     pico     p
10-15    E-15     femto    f
10-18    E-18     atto     a
10-21    E-21     zepto    z
10-24    E-24     yocto    y

SI Derived Units

(Please note: all units to the right of the slash are actually in the denominator!)

hertz: Hz = 1/s
newton: N = m kg/s2
Pressure, stress
pascal: Pa = N/m2 = kg/m s2
Energy, work, quantity of heat
joule: J = N m = m2 kg/s2
Power, radiant flux
watt: W = J/s = m2 kg/s3
Quantity of electricity, electric charge
coulomb: C = s A
Electric potential
volt: V = W/A = m2 kg/s3 A
farad: F = C/V = s4 A2/m2 kg
Electric resistance
ohm: Omega = V/A = m2 kg/s3 A2
siemens: S = A/V = s3 A2/m2 kg
Magnetic flux
weber: Wb = V s = m2 kg/s2 A
Magnetic flux density, magnetic induction
tesla: T = Wb/m2 = kg/s2 A
henry: H = Wb/A = m2 kg/s2 A2
Luminous flux
lumen: lm = cd sr
lux: lx = lm/m2 = cd sr/m2
Activity (ionizing radiations)
becquerel: Bq = 1/s
Absorbed dose
gray: Gy = J/kg = m2/s2
Dynamic viscosity
pascal second: Pa s = kg/m s
Moment of force
metre newton: N m = m2 kg/s2
Surface tension
newton per metre: N/m = kg/s2
Heat flux density, irradiance
watt per square metre: W/m2 = kg/s3
Heat capacity, entropy
joule per kelvin: J/K = m2 kg/s2 K
Specific heat capacity, specific entropy
joule per kilogram kelvin: J/kg K = m2/s2 K
Specific energy
joule per kilogram: J/kg = m2/s2
Thermal conductivity
watt per metre kelvin: W/m K = m kg/s3 K
Energy density
joule per cubic metre: J/m3 = kg/m s2
Electric field strength
volt per metre: V/m = m kg/s3 A
Electric charge density
coulomb per cubic metre: C/m3 = s A/m3
Electric displacement, electric flux density
coulomb per square metre: C/m2 = s A/m2
farad per metre: F/m = s4 A2/m3 kg
henry per metre: H/m = m kg/s2 A2
Molar energy
joule per mole: J/mol = m2 kg/s2 mol
Molar entropy, molar heat capacity
joule per mole kelvin: J/mol K = m2 kg/s2 K mol
Exposure (ionizing radiations)
coulomb per kilogram: C/kg = s A/kg
Absorbed dose rate
gray per second: Gy/s = m2/s3

cgs Units

1 erg = 10-7 J
1 dyn = 10-5 N
1 P = 1 dyn s/cm2 = 0.1 Pa s
1 St = 1 cm2/s = 10-4 m2/s
1 G = 10-4 T
1 Oe = (1000/(4 pi)) A/m
1 Mx = 10-8 Wb
1 sb = 1 cd/cm2 = 104 cd/m2
1 ph = 104 lx


18 Sep 2014:

22.9.-2.10. mathematics course

Liebig Medal for Prof. Reißig

hints for freshmen

Paper of this month

by Prof. Luger in JACS,

by Prof. Müller in Chem. Commun. and

by Prof. Sarkar in Chemistry




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Last modification: 2009-01-26