fermi (fm or f)
fermi (fm or f) :
A metric unit of distance formerly used in atomic physics. One fermi equals 10-15 meter, or 1 femtometer. The unit is named for Enrico Fermi (1901-1954), the Italian-American physicist who built the first nuclear reactor. There was a need for this unit before the metric prefixes for very small quantities were defined; now distances formerly measured in fermis are stated in femtometers instead
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