Defined by assuming a fixed numerical value of the frequency of electromagnetic radiation emitted by a caesium atom. (More precisely, it is 9,192,631,770 oscillations of a particular type of electromagnetic wave.)
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Meter (m)
Defined by assuming a fixed numerical value for the speed of light in empty space. (More precisely, it is the distance traveled by light in empty space in 1/299,792,458 of a second.)
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Kilogram (kg)
Defined by assuming a fixed numerical value of Planck's constant.
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Mole (mol)
One mole contains exactly 6.022 140 76 x 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit mol
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Kelvin (K)
Defined by assuming a fixed numerical value of the Boltzmann constant kB.
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Current (A)
Defined by assuming a fixed numerical value of the elementary charge e.
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Candela (cd)
The candela, symbol cd, is the SI unit of luminous intensity in a given direction (you don't need to know more about this one!)
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Systematic Error
An error that causes all data points to be inaccurate in a similar way. E.g. if you forget to zero a digital scale before measuring mass or if you measure length to a point that is offset from the planned point of measurement.
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Random Error
Errors caused by unknown and unpredictable issues related to the experiment.
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Vector
A quantity defined by both a magnitude and a direction
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