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1. Introduction The need for quantitative determination of an amount of substance (symbol: “n”) has given rise to a variety of ingenious tools to realise it. One of these inventions was the balance (Fig. 1) which allowed to compare amounts of substance directly using their
1. Introduction The need for quantitative determination of an amount of substance (symbol: “n ”) has given rise to a variety of ingenious tools to realise it. One of these inventions was the balance (Fig. 1) which allowed to compare amounts of substance directly using their