作者:揭锆椁     |      日期:2019-03-08 02:18:17
The world’s smallest set of scales could weigh viruses, say researchers at the Georgia Institute of Technology. By attaching tiny objects to the end of carbon nanotubes, they have measured the mass of objects that weigh just a thousandth of a picogram (Science, vol 283, p 1513). In the macro world, a calibrated spring can measure the mass of an object if you know the properties of the spring. A similar principle applies in the nano world: