“To know yet to think that one does not know is best; Not to know yet to think that one knows will lead to difficulty.” Lao Tzu, philosopher (6th century BCE).
Wednesday, 13 July 2016
Weights are measured
As part of the project to redefine the kilogram the NIST-4 watt balance
has completed new measurements of Planck’s constant. The value of h being
6.62606983 x 10–34 kg.m2/s with an uncertainty of plus or minus 22 on the last