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| metric
measurements |
A
meter has been officially defined to be
the distance traveled by light in a vacuum
in 1/299,792,458 second. All other length
and distance measurements in the metric
system derive from the meter (eg. km=
1000m, 1m= 1000mm) |
| imperial/
american measurements |
These
measurements have a less logical progression.
A yard can be defined as the length of
a pendulum that causes its arc to swing
in exactly 1 second. Other measurements
although not all are derived from this.
The most notable exception is the Nautical
mile which is the distance across 1' (1/60
of a degree) around the earths surface. |
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