The mysterious international conspiracy to get us all onto a single standard for all measurable units (the dreaded System Internationale) is governed by the National Institute of Standards and Technology (NIST).
The Fundamental or base units are:
Base Quantity (unit)
Length (meter)
Mass (kilogram)
Time (second)
Electric current (Ampere)
Thermodynamic temperature (Kelvin)
Amount of substance (mole)
Luminous intensity (candela)
The NIST website provides further information about Fundamental Unit symbols, definitions, origins, prefixes, rules of usage (this is an important one for how your work will be evaluated) and derived units (with examples).
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