It would appear the system we use for weight, volume and area is not related, but the metric system when determining weight, volume and area only require a ruler.
http://hypertextbook.com/facts/2002/...tOkereke.shtml
The .01 cent coin went from copper to zinc in 1982, in 1943 the .01 cent coin was steel/zinc coated, A warning, the zinc .01 cent piece when swallowed by a pet can kill the animal.
F. Guffey