The best part about this batch of changes is they push the mole and Avogadro&#x27;s constant out on their own where the belong, not linked to any other units. Now we&#x27;ll have only a single mass unit (kg) instead of two (kg and unified atomic mass unit) that we do now. This will knock carbon 12 of its perch as the definition of the &quot;other&quot; mass unit that&#x27;s been essential to use SI&#x27;s mole but was not actually SI itself.