May 15, 2003

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 cm2) and the book containing cross-sections has a picture of a barn on the cover.

Posted by Jargon File at May 15, 2003 10:58 AM

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