For precise measurement of the volume.
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送交者: 蓝隼 于 2007-06-20, 16:33:03:
回答: 作为标准公斤的物体干吗在乎不在乎他圆不圆? 由 HunHunSheng 于 2007-06-20, 15:05:21:
This is the way they define the kilogram. There is a detail essay in Scientific American (Dec. 2006 issue) on this topic.
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