KilogramInternational Prototype Kilogram shed 100 micrograms last century . International Prototype Kilogram measurement is set from the highly-guarded metal cylinder . German scientists are working out how many atoms are in a certain sphere . Method should allow them to redefine the kilo based on the mass of atoms .
International Prototype Kilogram shed 100 micrograms last century . Kilogram measurement is set from the highly-guarded metal cylinder . German scientists are working out how many atoms are in a certain sphere . Method should allow them to redefine the kilo based on the mass of atoms .