Take a weight off: 'Grand K' kilo being retired

Nobel prize winner William Phillips called it "the greatest revolution in measurement since the French revolution," which ushered in the metric system of meters and kilograms. The so-called "Grand K" kilogram, a cylinder of polished platinum-iridium alloy that has been the world's sole true kilo since 1889, is to be retired.

from UK News Headlines, Latest UK News and Live Updates - Times of India https://ift.tt/2qPERN1