Reply To: Shellac Mix ratio
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16 August 2020 at 12:09 pm
#674198
The SI of units is the primary legal system in USA.
The US customary system is derived from the SI units and is thus a secondary system kept for the convenience of people who like it.
The SI units are themselves derived from nature fundamental constants which can be used (with a proper lab) anywhere in the universe and is no longer based on artifacts conserved in Paris (France).
see:
https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9-concise-EN.pdf
To see US contribution to SI development and refinement, visit the NIST site.