The International System of Units (SI) provides definitions of units of measurement that are widely accepted in science and technology.
The kilogram (abbreviation, kg) is the SI unit of mass. It was originally defined as the mass of one litre of pure water.
The second (abbreviation, s or sec) is the SI unit of time.
The kelvin (abbreviation K), is the SI unit of temperature.
Kelvin is a temperature scale designed so that zero degrees K is defined as absolute zero and the size of one unit is the same as the size of one degree Celsius. source
The ampere (abbreviation, A) is the SI unit of electric current.
The candela (abbreviation, cd) is the SI unit of luminous intensity.
luminous intensity is a measure of the power emitted by a light source based on a standardized model of the sensitivity of the human eye.
The mole (abbreviation, mol) is the SI unit of material quantity. One mole is the number of atoms in 0.012 kilogram of the most common isotope of elemental carbon (C-12). This is approximately 6.022169 x 10 23 , and is also called the Avogadro constant.
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