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Mae llawer iawn o unedau nad ydynt yn rhan o'r [[System Rhyngwladol o Unedau]] ({{Iaith-fr|Le Système international d'unités}}; {{Iaith-en|International System of Units}}) ([[SI]])<ref>[http://www.bipm.org/en/CGPM/db/11/12/ Bureau International des Poids et Mesures]</ref> ond mae'n nhw'n cael eu derbyn ar y cyd â'r system honno.<ref>{{dyf gwe|teitl="Non-SI units accepted for use with the SI, and units based on fundamental constants"
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*Taylor, Barry N. (ed.) (2001). [http://physics.nist.gov/Pubs/SP330/sp330.pdf ''The International System of Units (SI)''] (2001, Special Publication 330). Gaithersburg, Maryland: National Institute of Standards and Technology. tud. 15–19.
*{{dyf gwe|teitl="Non-SI units accepted for use with the SI, and units based on fundamental constants"|url=http://www.bipm.org/en/si/si_brochure/chapter4/4-1.html|
[[Categori:Unedau Metrig nad ydynt yn Unedau SI]]
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