標題: 國際公斤原器少了50微克？？？ [打印本頁] 作者: aiping2100 時間: 2007-9-16 22:17 標題: 國際公斤原器少了50微克？？？ 前兩天看報紙，有一則這樣的消息：放于法國的國際公斤原器神密的減少了50微克，這對我們今后砝碼的傳遞是否有影響？從1886年確定的標準為何會神密的少了50微克？？討論一下哦~!作者: ljg5647 時間: 2007-9-17 09:16
我覺得對我們那么粗的計量工作沒什么影響, 只是對科研精密計量帶來麻煩
這些事不用我們擔心作者: lymex 時間: 2007-9-17 13:48
只發現一個香港的網站有這樣的描述。
我估計這消息屬于捕風捉影，來自很早就有的BIPM自己的描述：
The results of comparisons between the official copies and the international prototype show some divergence with time. The graph below shows changes of about 5 x 10–8 in the mass of the standards since their first calibration. All measurements are with respect to the international prototype. For this reason, the mass of the international prototype defines the x-axis of this graph.
There is no reason to suspect that the mass of the international prototype of the kilogram is more stable than its official copies. The question of stability can only be answered definitively by comparison with a fundamental constant of nature (such as the Planck constant or the mass of an atom of 28Si). Such experiments are being carried out in several national laboratories. So far, relative uncertainties of about 10–7 have been achieved.
