User:OldakQuill

'Abd Al-Rahman Al Sufi died 1001 years, to the day, before the birth of OldakQuill

Base Units

The following are the fundamental units from which all others are derived, they are dimensionally independant.

Name	Unit Symbol	Measure Of	Definition
metre	m	Length	The unit of length is equal to the length of the path travelled by light in a vacuum during the tim interval of 1/299 792 458 of a second
kilogram	kg	Mass	The unit of mass is equal to the mass of the international prototype killogram(a platinum-iridium cylinder) kept at the Bureau International des Poids et Mesures (BIPM), Sèvres, Paris.
second	s	Time	THe unit of time is the duration of exactly 9 192 931 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of caesium-133 atom.
ampere	A	Electrical Current	The unit of electical current is the constant current which, if maintained in two straight parallel conductors, of infinite length and negligable cross-section, placed 1 metre apart in a vacuum, would produce a force between these conductors equal to 2 x 10 ^-7 newton per metre of length.
kelvin	K	Absolute Temperature	THe unit of thermodynamic temperature (or absolute temperature) is the fraction 1/273.16 (exactly) of the thermodynamic temperature at the triple point of water.
mole	mol	Amount of Substance	THe unit of amount of substance is the amount of substance which contains as many elementary entities as there are atoms in 0.012 kilogram of pure carbon-12. [elementary entities may be atoms, molecules, ions, electrons, or particles].
candela	cd	Luminous Intensity	The unit of luminous intensity 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.