•Seven
Units: second (s), meter (m), kilogram
(kg), ampere (A), kelvin (K),
mole (mol), and (not used in this
course) candela (cd).
•Second
(s): Frequency of a certain cesium transition 9,192,631,770 cycles per second.
•Meter
(m): Distance traveled by light in vacuum
in 1/299,792,458
second.
•Kilogram
(kg): Standard body kept at the International Bureau of weights and measures in Sèvre (France).