kilogram

Reality is about to change. The kilogram which until now, has been defined as the mass of a certain artefact (or big K) held in a vault in Paris. They will define the kilogram by defining as planks constant as exactly 6.62607015 X 10^-34 Js. This then determines how big a kilogram is. This...

Making the roundest object in the world - very cool stuff: CSIRO scientists and optical engineers are working to turn a silicon cylinder into the perfect one kilogram sphere. The Avogadro Project plan is to bring together enough atoms of one substance, silicon, to make the perfect kilo...