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SI = Système International d'unités
Quantity, Name, Symbol
SI Prefixes
SI Derived Units
cgs Units
QUANTITY, NAME, SYMBOL
length
metre (meter): m
(the correct English spelling of the unit is "metre", but the variant
"meter" is frequently used in the United States)
mass
kilogram: kg
time
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
Frequency
hertz: Hz = 1/s
Force
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
Capacitance
farad: F = C/V = s4 A2/m2 kg
Electric resistance
ohm: Omega = V/A = m2 kg/s3 A2
Conductance
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
Inductance
henry: H = Wb/A = m2 kg/s2 A2
Luminous flux
lumen: lm = cd sr
Illuminance
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
Permittivity
farad per metre: F/m = s4 A2/m3 kg
Permeability
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
erg
1 erg = 10-7 J
dyne
1 dyn = 10-5 N
poise
1 P = 1 dyn s/cm2 = 0.1 Pa s
stokes
1 St = 1 cm2/s = 10-4 m2/s
gauss
1 G = 10-4 T
oersted
1 Oe = (1000/(4 pi)) A/m
maxwell
1 Mx = 10-8 Wb
stilb
1 sb = 1 cd/cm2 = 104 cd/m2
phot
1 ph = 104 lx
Links
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