Beard-second
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| SI units | |
|---|---|
| 5.000×10−9 m | 5.0000 nm |
| US customary / Imperial units | |
| 16.40×10−9 ft | 196.9×10−9 in |
The beard-second is a unit of length created as teaching exercise inspired by the light year, but for nuclear physics instead of astronomy.[citation needed] The beard-second is defined as the length an average beard grows in a second, or about 5 nanometers[1].
The beard-second is less popular than the Ångström (10-10 m). In physics it is also common to use the SI units, usually with the nano prefix; 1 nm = 10-9 m.
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