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Le Systéme International d´Unités

The International System of Units

Medzinárodná sústava jednotiek

1. Basic unites
meter [m] the meter is the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.

kilogram [kg] the kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.

second [s] the second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

ampere [A] the ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 Newton per meter of length.

kelvin [K] the Kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.

mole [mol] the mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12

candela [cd] the candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

2. SI derived unit
speed, velocity
mass density
specific volume
current density
magnetic field strength  


square meter
cubic meter
meter per second
meter per second squared
kilogram per cubic meter
cubic meter per kilogram
ampere per square meter
ampere per meter
mole per cubic meter
candela per square meter

3. Supplementary units
radian (rad) m/m plane angle  
steradian (sr) m2/m2 solid angle  
4. SI prefixes
factor name symbol   factor name symbol
101 deka da   10-1 deci d
102 hekto h   10-2 centi c
103 kilo k   10-3 mili m
106 mega M   10-6 mikro µ
109 giga G   10-9 nano n
1012 tera T   10-12 piko p
1015 peta P   10-15 femto f
1018 exa E   10-18 atto a
1021 zetta Z   10-21 zepto z
1024 yotta Y   10-24 yocto y
1024 yotta Y   10-24 yocto y



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