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無次元量

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Fluorescein aqueous solutions, diluted from 10000 to 1 part per million in intervals of ten-fold dilution. At 10000 ppm the solution is a deep red colour. As the concentration decreases, the colour becomes greenish-orange, then a vibrant yellowish-green, with the final 1 ppm sample a very pale yellowish-green.

パーツパー表記（ppm/ppb/ppt）の定義と科学的な活用法

ppmppbppt無次元量
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無次元量とは何か？科学と工学を支える「単位のない数」の仕組み

無次元量次元解析バッキンガムのπ定理レイノルズ数
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