[time-nuts] The forbidden question

[Tony Finch]

Will Kimber <zl1tao at gmx.com> wrote:
>
> The thing with TIME is that its measurement is a abstract concept.  Most
> other "standards" have a physical representation.

The metre is derived from the second and the speed of light using
interferometry. The kg is derived from the metre and the second and the
planck constant using a watt balance.

A lot of metrology is based on precise frequency standards.

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Forties: Cyclonic 3 to 5, increasing 6 or 7 in northeast. Moderate or rough,
becoming slight. Fog patches, thundery rain later. Moderate, occasionally very
poor.