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Can somebody explain to me why we need both kilogram and mole (https://en.wikipedia.org/wiki/Mole_(unit) https://en.wikipedia.org/wiki/Mole_(unit))? One can be

by zvrba 8y ago

Can somebody explain to me why we need both kilogram and mole (https://en.wikipedia.org/wiki/Mole_(unit) https://en.wikipedia.org/wiki/Mole_(unit))? One can be defined in terms of the other.

deleted 8y ago
[deleted]
Koshkin 8y ago
Kilogram of any substance weighs the same, whereas the moles of different substances have different weights (numerically equal to the molecular weight of the substance).
- Doxin 8y ago
  Sure, but can't the kilogram then be easily defined in e.g. carbon-moles?
  - Koshkin 8y ago
    it could (again, based on a particular isotope), but only in theory, because how would one count the mole worth of atoms?
    - Doxin 8y ago
      isn't one mole of carbon-12 by definition 12 grams?