Joseph Bento wrote:

> While I think time and distance can be measured without a physical  
> reference (as per your example), I wonder how weight measurements  
> might be referenced?  I don't think the scientists have figured out a  
> way to use physical constants for a weight reference.

See also
<http://en.wikipedia.org/wiki/SI_base_unit#Proposal_to_modify_the_definitions>

Gerhard
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist