international prototype kilogram

基本解释

The name is a reference to International Prototype kilogram, as a base unit of mass in the International System of Units.
它的名字和国际单位中表示基本聚合物质质量千克有关。
The international prototype kilogram, the primary standard (see weights and measures) for weight, is made of an alloy comprising 90% platinum and 10% iridium.
国际标准质量千克的原型就是由90%铂和10%铱的合金制成的。

' The currently accepted answer is the mass of a cylinder of platinum and iridium called the International Prototype Kilogram.
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Because of this, the actual International Prototype Kilogram (yes, there does only seem to be one in existence) is stored in a vault in Sevres, France, limiting the lay person's ability to determine the actual weight of a kilogram.
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The problem with that definition, of course, is that not just anybody can measure it -- since most of us don't have an International Prototype Kilogram laying around, especially since every time the thing is picked up a few atoms rub off of it making it a little bit lighter.
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