It's official! The kilogramme has put on weight
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The official kilogramme – a cylinder-shaped hunk of metal - that defines the fundamental unit of mass, has itself gained weight, scientists say.
Scientists at Newscastle University have found that due to surface contamination the original kilogramme is likely to be tens of microgrammes heavier than it was when the first standard was set in 1875.
As a result, each country that has one of these standard masses has a slightly different definition of the kilogramme, which could throw off science experiments that require very precise weight measurements or international trade in highly restricted items that are restricted by weight, such as radioactive materials.
The original kilogramme - known as the International Prototype Kilogramme or the IPK - is the standard against which all other measurements of mass are set.
Stored in the International Bureau of Weights and Measures in Paris, 40 official replicas of the IPK were made in 1884 and distributed around the world in order to standardise mass.
Now Professor Peter Cumpson and Dr Naoko Sano have used cutting-edge X-ray Photoelectron Spectroscopy (XPS) to analyse surfaces similar to the standard kilogramme to assess the build-up of hydrocarbons ¿ and how to remove them.
Ozone and ultraviolet light could be used to clean the kilogrammes without damaging them, LiveScience reported.
"Statute decrees the IPK is the kilogramme," explained research lead Peter Cumpson, Professor of MicroElectroMechanical Systems (MEMS) at Newcastle University.
"It doesn't really matter what it weighs as long as we are all working to the same exact standard - the problem is there are slight differences. Around the world, the IPK and its 40 replicas are all growing at different rates, diverging from the original," Cumpson said.
"We're only talking about a very small change ¿ less than 100 microgrammes ¿ so, unfortunately, we can't all take a couple of kilogrammes off our weight and pretend the Christmas over-indulgence never happened," Cumpson added.