Jed Neel jedneel4865815
  • Farup
  • https://www.findinall.com/profile/bridgetlansell
  • Prior to the current definition, the kilogram was defined as being equal to the mass of a physical prototype, a cylinder made of a platinum-iridium alloy, which was an imperfect measure.

  • Joined on 2026-03-19
Updated 2026-03-19 17:30:11 +08:00