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迷信家将重新界说“千克”

kira86 于2018-11-21公布 l 已有人阅读
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在往年国际计量大会上,迷信家们分歧投票决议辞别陈旧的界说千克的办法,他们会接纳普适常数作为基准的新丈量体系。接纳了快要140年的办法将成汗青。
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Scientists to Reboot the Kilogram

迷信家将重新界说“千克”

This is a copy of the lump of metal which since 1879 has been single-handedly responsible for telling the world exactly how much a kilogram weighs.

这是一块铂铱合金圆柱体,自1879年来,该圆柱体就成为了国际单元“千克”的独一基准。

But many of the world's scientists worry that this metal cylinder currently stored in a French lab carries too much weight unintended.When you just get it out of the vault, it's slightly dirty.But the whole process of cleaning or handling or using the mass can change its mass.So it's not the most, not the best way perhaps of defining mass.It's been very good for the last 130 years, but it's also a single point of failure in our entire mass system.

但是来自环球各地的迷信家担忧,随着工夫增长,这个现在保管于一间法国实行室的金属圆柱体的分量发作了预料之外的变革。每次把它从保险库里拿出来的时分,它都市细微的沾染尘土。那么把它清扫洁净、或许拿取或是运用其测质量的时分,它的质量都市发作变革,以是这并不是界说质量最好的办法。在过来的一百三十年内,用这种办法界说质量是很不错的,但其同时也是我们整个质量零碎里的一个单点毛病。

In a vote this Friday, scientists from the General Conference on Weights and Measures are expected to vote unanimously to say goodbye to that kilogram weight.They will adopt a new measuring system based on universal constants,the scientific term for things that never change, like gravity or the speed of light. A kilogram will still be a kilogram, but like the speed of light, it can't ever change.There will be absolutely no change whatsoever, and it's taken an enormous amount of effort and agreement to get to that point.

本周五召开的国际计量大会上,迷信家们将分歧投票决议辞别这种界说千克的办法。他们将会接纳一种以普适常数作为基准的新丈量体系,普适常数这一术语指重力或光速等永不改动的常量。一千克照旧代表一千克,但是就像光速一样,这个数值永久都不会改动。这个数值无论怎样都不会发作改动,要完成这一点的确要破费宏大的高兴,还要取得各人的分歧承认。

So why do it? Because no matter how precise the measurements of that lump of metal in France,its weight has changed ever so slightly over time.It's never perfect.And when engineers deal with weight on a smaller and smaller scale,that little imperfection becomes a huge imperfection called an uncertainty in scientific terms.And big uncertainties can make things like the tiny microchip in your new phone less precise and less efficient.We need to be met...to be able to measure at different scales because the uncertainties built up very, very quickly.The new system means no more uncertainty.And scientists say that will help clear the way for new more advanced technology in the future.

那么为什么肯定要这么做呢?由于不管放在法国的这个金属块丈量有何等准确,它的质量随着工夫变革不断在细微发作改动,永久都不是最完满的谁人数值。以是当工程师在十分十分小的范畴内触及到质量题目时,这种巨大的不准确就会凸显成为十分严峻的不准确,术语称为不确定性。这种极大的不准确会招致像老手机的微型芯片如许的物品越来越不准确,结果越来越差。我们需求……我们需求可以在差别的标准上停止丈量,由于不确定性的累积十分快。新的丈量体系意味着不再存在不确定性。迷信家称这将为将来的高新科技开展做好预备。

Kevin Enix VOA News

美国之音记者Kevin Enix报道。

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