18 Nov
2018
18 Nov
'18
1:13 p.m.
Simon Plouffe <simon.plouffe@gmail.com> wrote:
This is why they decided to make the kilogram definition based on the Planck constant , there was also a project to define the kilogram using a specific portion of 1 element based on the mole : 6.022 x 10^23 atoms, they made 1 prototype of a <perfect> sphere for it but that idea was abandoned.
Personaly, I prefered the second definition (the sphere), mainly because it uses Pi. ;-).
It does. In the new system, the kilogram depends on Planck's reduced constant, which is defined as being exactly 6.62607015*10^-34/(2 pi) joule seconds. :-)