Micri-
obsolete metric unit prefix for 10^-14
Micri- (unit symbol mc-) is an archaic non-SI decimal metric prefix for 10−14.
It was proposed as a prefix for the CGS-unit of energy, the erg. The micrierg was proposed in 1922 by William Draper Harkins as a unit of energy equating to 10−14 erg, the equivalent to 10−21 joule, as a convenient unit to measure the surface energy of molecules in surface chemistry. It saw limited use. One electronvolt is about 160 micriergs. In 1991, the micrierg was officially designated the zeptojoule when the zepto- prefix for 10−21 was officially adopted.
“Micri-” enters the record as obsolete metric unit prefix for 10^-14. Crown Archives preserves that source wording while asking what Micri-, obsolete and metric can confirm, complicate or overturn.
Why this record matters
“Micri-” is worth following because a concise public description often conceals a longer documentary argument. Here, Micri-, obsolete and metric provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 4, 2026. The linked authority identifier is Q20949649. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1922 and 1991.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
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The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Micri-”, its source revision and the description used here.
- Expand the search: follow Micri- primary sources, Micri- archive and Micri- research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Micri-” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.