There are now discrepancies between copies of the kilogram and the master version held in a French vault Scientists have changed the way the kilogram is defined. Currently, it is defined by the ...

Now, the kilogram is defined in relation to the Planck constant, the smallest amount of energy a photon can carry. With this constant, scientists can make ultra-precise mass measurements using the ...

You see, Le Grand K is the most perfect kilogram on the planet. For weight measurements to mean anything, every scale has to be calibrated on the exact same standard, and that’s where this ...

Connecting mass with electrical quantities is one way to make sure the kilogram doesn’t slip off its defined standard. But now, scientists at the University of Bremmen and the Natural Metrology ...