Abstract
Scientists
strive for accuracy, but often mistake precision for it. They look for the ninth
or tenth decimal place of Avogadro's number ─ relating it to the arbitrarily defined mass of a
chunk of metal in
No
= 279 = 604 462 909 807 314 587 353 088 = 6.0446 x 1023
This establishes Avogadro's
number as unarguably accurate and precise to 24 digits! Actually, the accuracy
and precision are infinite, as the number is an integer. Attention should be
turned to establishing the mass of that chunk of metal and worrying about its
precision — not the reverse. Better to have one value established with
certainty based on scientific logic than have all uncertain.
Standards bodies and precious metals purveyors have
howled
at any change in the specification of the gram and