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What is the unit of weight measured by the world’s most sensitive scales?

What is the unit of weight measured by the world’s most sensitive scales?

Answer: The yoctogram, which is just one septillionth of a gram.

According to New Scientist, scientists in Barcelona, Spain, used scales made of short nanotubes to weigh an atom of xenon to the nearest yoctogram. This makes it the first scale capable of detecting a single proton, which weighs in at 1.7 yoctograms.