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化学中所用的标准单位是克,千分之一是毫克,再是千分之一为微克microgram,即一百万分之一克。平常化学分析所用的材料普通为一二克。微量分析Micro-analysis 所用的是五十毫克,至于超微化学ultra-microchemistry 的技术则须更进一步,要用显微镜来做观察的工具。所用材料不过是一微克而已,这大约是用铅笔在纸上点了极小的一点所有的重量。我们的手指捺在玻璃杯上的指印恐怕就有一百多微克。
The standard unit used in chemistry is gram, the one thousandth is milligram, then the one thousandth microgram microgram, that is, one millionth of a gram. Ordinary chemical analysis of the material used is generally one or two grams. Microdialysis Microanalysis uses fifty milligrams, and the technique of ultra-microchemical ultra-microchemistry goes one step further, using a microscope for observation. The material used is only a microgram, which is about the weight of a tiny bit of pencil on a piece of paper. There is probably more than a hundred micrograms of fingerprints on our glass as our fingers snap.