-All measurements in Science come in 2 parts: the number + the unit. These number and unit combinations are called quantities.
-Basic units:
Length Metre m
Time Second s
Mass Kilogram kg
Amount of Substance Mole mol
Luminous Intensity Candela cd
Temperature Kelvin K
Electric Current Ampere A
Unit System
SI system:
--A French system dating back to the early 1800's using prefixes and symbols.
--metre-second-kilogram
Imperial System:
--feet-second-pound
SI Prefixes and Conversions Factors
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