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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


2 Mar 2017:

Paper highlights (archive)




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