Definition of kilogram changes from May 20, 2019- What this means

Scientists have changed the way the kilogram is defined. Photo: Courtesy

For over 130 years since its establishment in 1889, Kilogram has been defined by the weight of a platinum-based ingot called "Le Grand K" which is locked away in a safe in Paris under two bell jars in a climate-controlled vault.

In November 2018, during the General Conference on Weights and Measurements, researchers who met in Versailles voted in favour of a new definition of kilogram basing on an electric current.