Base Physical Quantities

DescriptionSymbol for dimensionComments
lengthlThe one-dimensional extent of an object.metre (m)L
MassmThe amount of matter in an object.kilogram (kg)Mextensive
TimetThe duration of an event.second (s)T
Electric currentIRate of flow of electrical charge.ampere (A)I
TemperatureTAverage energy per degree of freedom of a system.kelvin (K)Θintensive
Amount of substancenNumber of particles compared to the number of atoms in 0.012 kg of 12C.mole (mol)Nextensive
Luminous intensityLAmount of energy emitted by a light source in a particular direction.candela (cd)J

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