JargonFile/entries/barn.txt

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2014-04-26 10:52:28 -04:00
barn
n. [uncommon; prob. from the nuclear military] An unexpectedly large quantity of something: a unit of measurement. Why is /var/adm taking up so much space? The logs have grown to several barns. The source of this is clear: when physicists were first studying nuclear interactions, the probability was thought to be proportional to the cross-sectional area of the nucleus (this probability is still called the cross-section). Upon experimenting, they discovered the interactions were far more probable than expected; the nuclei were as big as a barn. The units for cross-sections were christened Barns, (10 -24 cm 2 ) and the book containing cross-sections has a picture of a barn on the cover.