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SI Units
SI = Système International d'unités
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
(Please note: all units to the right of the slash are actually in the denominator!)
- 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
- Conversion of units
- Index General chemistry
- The NIST Reference on Constants, Units, and Uncertainty
- The International System of Units (SI) (BIPM)
- A Dictionary of Measures, Units and Conversions
