3 ms·

One kg and one litre of water are the same thing.

• jacquesm 11y ago
  At what temperature?
  • protomyth 11y ago
    "water at the melting point of ice" from an old definition
    • jacquesm 11y ago
      Exactly, so you need to add that or it won't be true most of the time.
• kqr 11y ago
  Inofficially, it has been. Technically, it's not quite true. Water has a density of 999.97 kg/m³.
  • seunosewa 11y ago
    That's unfortunate. How did it come to be that way?
    • lvh 11y ago
      Water is too hard to keep constant, and too hard to reproduce. Keeping it exactly in 1dm3 is tricky, for example. Not for "regular" use, with a few significant digits of course; but when you're defining fundamental physical constants, atoms count.
• ColinWright 11y ago
  That depends on the temperature ...
• nkrisc 11y ago
  At 0C
• ufo 11y ago
  Not really. Because of temperature, usitipe composition, etc, the weight of a liter of water is not precise enough for physicists.