CURRENT AFFAIRS

Detailed explanation-1: -It will be adopted on May 20, which is World Metrology Day. The new definition of kg involves accurate weighing machines called ‘Kibble balance’. It uses the constant to measure the mass of an object using a precisely measured electromagnetic force.

Detailed explanation-2: -“The Plank constant has been fixed at 6.626070150 × 10−34 kg⋅m2/s using the IPK as standard, ” explains Eichenberger. “So from today, one kilogram will stay the same. If the IPK drifts further with time then its value will change, but any mass calibration will have an uncertainty of the order of 20 parts per billion.”

Detailed explanation-3: -The kilogram was originally defined in 1795 as the mass of one litre of water. The current definition of a kilogram agrees with this original definition to within 30 parts per million. In 1799, the platinum Kilogramme des Archives replaced it as the standard of mass.

Detailed explanation-4: -The International Prototype Kilogram, a.k.a. Le Grand K or the Big K or IPK, stored in a vault in Paris, was replaced by a formula using Planck’s constant in 2019. The IPK was losing mass so the metrology community redefined the kilogram with the aid of the Planck constant.