The Barn is a slightly humorous unit of area used in nuclear physics. When atoms are bombarded with smaller particles such as electrons, the electrons are scattered as if the nucleus of the atom was a tiny solid object. The barn is used to express the apparent cross-sectional area of this scattering object. One barn is equal to 1E-28 square meters. Using this unit, physicists can say that such and such a nucleus is "as big as a barn", or 10 barns, or whatever. The proper SI unit to use for these measurements is the square femtometer (fm2); one barn equals 100 fm2.

About Are

The are is a unit of area equal to 100 square meters. The word is pronounced the same as "air". Being the area of a square 10 meters on each side, the are is a little large for measuring areas indoors and a little small for measuring areas outdoors. As a result, the are is not used as often as its multiple, the hectare (ha). One are is approximately 1076.3910 square feet, 119.5990 square yards, or 0.02471 acre.

Barn to Are Conversion Table

Barn	Are	Are	Barn
0.1	1.000e-31	0.1	1.0000000000000001e+29
0.5	5.000e-31	0.5	5e+29
1	1.000e-30	1	1e+30
2	2.000e-30	2	2e+30
5	5.000e-30	5	5.0000000000000004e+30
10	1.000e-29	10	1.0000000000000001e+31
20	2.000e-29	20	2.0000000000000002e+31
25	2.500e-29	25	2.5e+31
50	5.000e-29	50	5e+31
100	1.000e-28	100	1e+32
250	2.500e-28	250	2.5000000000000002e+32
500	5.000e-28	500	5.0000000000000004e+32
1000	1.000e-27	1000	1.0000000000000001e+33

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