One cubic centimetre of water at 4 degrees Celsius used to define one gram (or more precisely one litre -> one kilogram, which comes out to be the exact same th

One cubic centimetre of water at 4 degrees Celsius used to define one gram (or more precisely one litre -> one kilogram, which comes out to be the exact same thing) [1], [2]. Although 1 cm^3 of water is still pretty damn close to 1g. [1] https://en.wikipedia.org/wiki/Grave_%28unit%29 https://en.wikipedia.org/wiki/Grave_%28unit%29 [2] https://www.youtube.com/watch?v=ZMByI4s-D-Y https://www.youtube.com/watch?v=ZMByI4s-D-Y (around 1:50, and actually the whole video is excellent)