7 quantities have these units.
Time = second
Length = metre
Mass = kilogram
Temperature = kelvin
Quantity of matter = mole
Electric current = ampere
Luminous intensity = candela
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Derived units
Combinations of fundamental units.
Examples: Newton, Volt
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Random uncertainty
Uncertainty due to the inexperience of the experimenter and the difficulty of reading instruments.
They can be reduced by repeated measurements and taking an average of the measurements.
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