To save pounds, it privyazhut to the number of Avogadro
fact is that despite the most severe precautions, the mass of the cylinder and six exact copies of the changes - in particular, due to the fact on its surface dust settles. And while the standard, together with copies regularly take steam baths, a century difference in weight between it and its copies has reached 50 micrograms, and it was almost a disaster.
To further avoid such trouble, scientists are trying different ways to redefine the kilogram, tied it, followed by meter and seconds ... full text
Source: CNews
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