每立方空气中含有29到850微微克浓度。一微微克是一克的万亿分之一。
It was found in concentrations of 29 to 850 pico grammes per cubic metre of air. A micro gramme is one trillionth of a gramme.
根据加州大学伯克利分校的教授约翰·库比亚托维兹所说，下载满容的电子书阅览器与空的阅览器相比，差距仅有1微微微克，也就是10-18 克（十的负十八次方克）。
According to John Kubiatowicz, from the University of California, Berkeley, the difference between an empty e-reader and a full one is just one attogram, or 10-18 of a gram.
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