>> Scientists are about to give the kilogram what is a apparently a much needed facelift. This is a replica of watts for more than a century was the kilogram. The standard for which we define what a kilogram actually weighs. A lump of dusty platinum and iridium. The real one is locked away in Paris.
But scientists have decided that it needs to be swapped for something a little more modern. Because despite the metal being kept in carefully controlled environments, its weight does change over time. Too much for it still to be considered totally accurate. A heavy weight meeting at the palace of Versailles in Paris this week will finally see the kilogram replaced with something that has a constant weight.
The new method revolves around a value found in physics called Planck's constant that scientists believe never changes. If that sounds complicated, it's because it is. It won't change how much you pay for a kilogram of fruit at the market, the average person won't see a difference. The experts say the change will be better for research and technology and may see effects in more down-to-earth sectors like retail.