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SI units

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SI = Système International d'unités

  1. Size, name, symbol
  2. SI prefixes
  3. SI derived units
  4. cgs units

Size, name, symbol

length
Meter: m
 
Dimensions
Kilograms: kg
 
time
Second: s
 
electric current
Ampère: A
 
thermodynamic temperature
Kelvin: K
 
Amount of substance
Mole: mole
 
Light intensity
Candela: cd
 

SI prefixes

Exponent (to 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

(Note: all units to the right of the slash are in the denominator!)

frequency
Hertz: Hz = 1 / s
 
force
Newton: N = m kg / s2
 
Pressure, mechan. tension
Pascal: Pa = N / m2 = kg / m s2
 
Energy, work, amount of heat
Joule: J = N m = m2 kg / s2
 
power
Watt: W = J / s = m2 kg / s3
 
electric charge
Coulomb: C = s A
 
electrical voltage
Volt: V = W / A = m2 kg / s3 A.
 
capacity
Farad: F = C / V = ​​s4 A.2/ m2 kg
 
electrical resistance
Ohm: Omega = V / A = m2 kg / s3 A.2
 
electr. Conductance
Siemens: S = A / V = ​​s3 A.2/ m2 kg
 
magnetic river
Weber: Wb = V s = m2 kg / s2 A.
 
Magnetic induction
Tesla: T = Wb / m2 = kg / s2 A.
 
Inductance
Henry: H = Wb / A = m2 kg / s2 A.2
 
Luminous flux
Lumen: lm = cd sr
 
Illuminance
Lux: lx = lm / m2 = cd sr / m2
 
radioactivity
Becquerel: Bq = 1 / s
 
Absorbed (radiation) dose
Gray: Gy = J / kg = m2/ s2
 
Dynamic viscosity
Pascal second: Pa s = kg / m s
 
Torque
Newton meter: N m = m2 kg / s2
 
Surface tension
Newtons per meter: N / m = kg / s2
 
Heat flux density
Watts per square meter: W / m2 = kg / s3
 
Heat capacity, entropy
Joules per Kelvin: J / K = m2 kg / s2 K
 
Specific heat capacity, specific entropy
Joules per kilogram Kelvin: J / kg K = m2/ s2 K
 
Specific energy
Joules per kilogram: J / kg = m2/ s2
 
Thermal conductivity
Watt per meter Kelvin: W / m K = m kg / s3 K
 
Energy density
Joules per cubic meter: J / m3 = kg / m s2
 
Electric field strength
Volt per meter: V / m = m kg / s3 A.
 
Electric charge density
Coulomb per cubic meter: C / m3 = s A / m3
 
Electric flux density
Coulomb per square meter: C / m2 = s A / m2
 
Influence
Farad per meter: F / m = s4 A.2/ m3 kg
 
permeability
Henry per meter: H / m = m kg / s2 A.2
 
Molar energy
Joules per mole: J / mol = m2 kg / s2 mol
 
Molar entropy, molar heat capacity
Joules per mole Kelvin: J / mol K = m2 kg / s2 K mol
 
Exposure
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 pc = 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