fermi = 0.000000000000001 length
Try converting from "fermi" to angstrom, archin (Russian archin), Biblical cubit, city block (informal), earth to moon (mean distance earth to moon), ell, en (typography en), fathom, football field, Greek palm, Greek span, link (surveyors link), marathon, nautical league, parasang, point (typography point), ri (Japanese ri), Roman foot, span (cloth span), survey foot, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
fermi = 4.56E-18 cable length, 3.94E-12 caliber (gun barrel caliber), 1.09E-17 city block (informal), 5.69E-12 en (typography en), 5.47E-16 fathom, 4.50E-14 finger, 3.00E-12 French, 1.35E-15 gradus (Roman gradus), 2.16E-15 Greek cubit, 4.32E-15 Greek span, 2.07E-19 league, 1.55E-18 li (Chinese li), 4.72E-13 line, 3.94E-11 mil, 1.78E-19 parasang, 3.38E-15 Roman foot, 1.09E-17 soccer field, 7.59E-20 spindle, 5.40E-18 stadia (Greek stadia), 6.21E-19 UK mile (British mile).
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