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What is the problem with defining the kg in terms of the already existing atomic mass unit? See http://en.wikipedia.org/wiki/Atomic_mass_unit http://en.wikiped
by abrahamsen 17y ago
What is the problem with defining the kg in terms of the already existing atomic mass unit?
See http://en.wikipedia.org/wiki/Atomic_mass_unit http://en.wikipedia.org/wiki/Atomic_mass_unit
The atomic mass unit is already associated with the mole, which is in SI.
- tokenadult 17y agoThere have been attempts to redefine the mole. http://www.iop.org/EJ/article/0026-1394/46/3/022/met9_3_022.pdf?request-id=b198c31a-dd8d-41bc-8f0e-dcc21a0dd920 http://www.iop.org/EJ/article/0026-1394/46/3/022/met9_3_022....
- sethg 17y agoI think the trick is to define the kg in terms of something that is not only a universal constant but can also be practically measured. If I redefine the gram as the mass of 6e23 atoms of carbon-12, and you give me a big pile of carbon-12 and say "what's the mass?" and I can't count exactly how many atoms are in the pile, then my definition isn't very useful.