To save pounds, it privyazhut to Avogadro's number
The fact is that despite the most severe precautions the mass of the cylinder and its six replicas of changes - in particular, due to the fact that on the surface of the dust settles. And while the standard together with copies of regularly take steam baths, a century difference in weight between it and its copies has reached 50 micrograms, and this is almost a disaster.
To further avoid such неприятностей, ученые пытаются различными способами переопределить килограмм, привязав его, вслед за метром и секунд… полный текст
Источник: CNews
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