measurement

FUNDAMENTAL QUANTATIES

kilogram

Kilogram : Defined by the mass of platinum-iridium cylinder kept at the International Bureau of weight and mass in France.

platinum-iridium cylinder

meter

Meter : Defined by the distance travelled by light in 1/29979245 seconds in vacuum.

second

Second : Defined by 9192631770 periods of Electromagnetic Radiation emitted during two low levels of Cesium-133 atoms.

atomic clock

mole

Mole : Defined by the amount of substance that contains as much as atoms/molecules as there is in 0.012kg of C¹².

12 grams of carbon = 1mole

kelvin

Kelvin : Defined such that the Boltzman constant would be equal to 1.380649x10^-23.

candela

Candela : Defined by luminous intensity in a certain direction emitted by the source of Electromagnetic Radiation of 540x10¹² Hertz that has the intensity of 1/683 watt per steradian in that direction.

ampere

Ampere : Defined as an elementary charge that would be equal to 1.602176634x10^-19 coulomb.

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