King of kilograms is no more as metric system gets a makeover
By 
Katrina Krämer2018-11-16T12:28:00
Metre convention countries have agreed to redefine four of the seven SI base units and link them to immutable natural constants
Today marks the end of units of measurement as we know them. At a meeting in Versailles, France, representatives of 60 countries have unanimously agreed to overhaul the base units’ definition and, from now on, link them to fundamental laws of nature. The decision has ended the reign of the king of kilograms, the 140-year-old platinum–iridium cylinder known as le Grand K. The original kilogram is kept in a vault in Paris and all mass measurements on the planet can be traced back to.