

The gram was originally defined as “the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre [1 cm3], and at the temperature of melting ice”.
Why? Who knows. If they’d already decided on the meter, then the most logical definition of a litre is pretty awkward. You’d think it would be 1 cubic meter of water, because then the unit of volume is 1 unit of length cubed. Then one gram would be one litre of water, which is today 1000 kg, or one metric ton.
But, then for everyday things people would be using microlitres and micrograms.
Really, the metre should have been the replacement for the inch (i.e. the centimeter). Then you could have 1 litre being 1 cubic meter (what is today 1 mL) and then the unit of mass would be the mass of 1 L of water, which would be 1 gram. A person’s height would be in hm, and long travel distances would be in Mm.





While we’re on the subject, can we please kill off “kilowatt hours”. Fuckers, those are Joules, 3.6 Megajoules specifically.