Since 1889, the kilogram has been defined by a platinum and iridium cylinder held in the depths of a Paris vault. Society is intrinsically dependent on the accuracy of this measurement. However, it has been losing weight and this year will be redefined using 21st century physics. Join Stuart Davidson as he discusses this historic moment.
Stuart Davidson is the Head of Mass metrology and responsible for maintaining the UK Mass scale at the National Physical Laboratory (NPL).