length · Various · Modern

beard-second

variantinformal

Record: M359
Definition quality: Informal / humorous variant-dependent
Conversion mode: variant selection
Calculator: Variant selection required

Definition

University mechanics material documents competing conventions.

Reference value

10 nm or 5 nm

History & use

University mechanics material documents competing conventions.

Modern use

Used mainly as an informal, humorous, or illustrative reference rather than an official measurement standard.

Did you know?

Its name looks singular, but the historically responsible calculator result is plural: users must choose among documented variants rather than receive one universal conversion.

Documented variants

Beard-second (10 nm convention)

length · Various · Modern

One Beard-second (10 nm convention) is equal to 1.000000 × 10^-8 metres.

informal

Beard-second (5 nm convention)

length · Various · Modern

One Beard-second (5 nm convention) is equal to 5.000000 × 10^-9 metres.

informal

Sources & evidence

Source tier Tier A — government / museum / authoritative institutional source · confidence Moderate-High

Source 1 — https://www.physik.uni-leipzig.de/jvwikis/mechanics/book/chap1/1.1_basic_notions_of_mechanics

Related measurements

metre

length · International · Modern

SI base unit of length. Its definition fixes the speed of light in vacuum at exactly 299,792,458 m/s, with the second defined from the caesium-133 hyperfine frequency.