alleryThe kilogram was first defined in 1795 as the mass of one litre of what?
AIron
BMilk
CMercury
DWater
Answer & Solution
Correct answer: D. Water
1. The metric system was created during the French Revolution.
2. In 1795 the kilogram was defined as the mass of one litre of water.
3. This is why a litre of water has a mass of about 1 kg. The other substances were never used for this definition.
_Source: Wikipedia, Kilogram, Lead section_
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