<Table> SI base units and standards <Tr> <Th> Base quantity </Th> <Th> Name </Th> <Th> Symbol </Th> <Th> Definition </Th> </Tr> <Tr> <Td> Length </Td> <Td> metre </Td> <Td> m </Td> <Td> The length of the path travelled by light in a vacuum during a time interval of 1 / 299792458 of a second </Td> </Tr> <Tr> <Td> Mass </Td> <Td> kilogram </Td> <Td> kg </Td> <Td> The mass of the international prototype kilogram (IPK) </Td> </Tr> <Tr> <Td> Time </Td> <Td> second </Td> <Td> s </Td> <Td> The duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium - 133 atom </Td> </Tr> <Tr> <Td> Electric current </Td> <Td> ampere </Td> <Td> </Td> <Td> A constant current which, if maintained in two straight parallel conductors of infinite length and negligible circular cross-section, placed 1 metre apart in a vacuum, would produce a force equal to 6993200000000000000 ♠ 2 × 10 newtons per metre </Td> </Tr> <Tr> <Td> Thermodynamic temperature </Td> <Td> kelvin </Td> <Td> </Td> <Td> The fraction 1 / 273.16 of the thermodynamic temperature of the triple point of water </Td> </Tr> <Tr> <Td> Amount of substance </Td> <Td> mole </Td> <Td> mol </Td> <Td> The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon - 12 </Td> </Tr> <Tr> <Td> Luminous intensity </Td> <Td> candela </Td> <Td> cd </Td> <Td> The luminous intensity, in a given direction, of a source emitting monochromatic radiation of a frequency of 7014540000000000000 ♠ 540 × 10 Hz with a radiant intensity in that direction of 1 / 683 watt per steradian </Td> </Tr> </Table> <Tr> <Th> Base quantity </Th> <Th> Name </Th> <Th> Symbol </Th> <Th> Definition </Th> </Tr> <Tr> <Td> Length </Td> <Td> metre </Td> <Td> m </Td> <Td> The length of the path travelled by light in a vacuum during a time interval of 1 / 299792458 of a second </Td> </Tr> <Tr> <Td> Mass </Td> <Td> kilogram </Td> <Td> kg </Td> <Td> The mass of the international prototype kilogram (IPK) </Td> </Tr>

What is the relationship between measurement and quality control