Defined quantitative measures

Seven basic (Système International) SI units:

s, m, kg, mol, K, cd, A

(some measures at precision of 14 significant figures)

casa.colorado.edu/~ajsh/sr/postulate.html

physics.nist.gov/cuu/Uncertainty/

scienceworld.wolfram.com/physics/SI.html

Quantal: Planck time, length: 10-43 seconds, 10-35 meters,

mol=6.0225 1023 entities.

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