The word “chemistry” in Arabic (Alchemie) is derived from the word “chem.” or “chemeia,” which means “amount.” This is because the Muslim scientists who established this science used to say: if we added a certain amount (chemeia) of this substance to another amount of another substance the result will be the following. This name in itself illustrates an important fact, and that is that Muslim scientists were the first to discover the theory of proportions in combining substances. This was five centuries before the chemist Brawest. This theory states that substances do not combine except with certain proportions and weights for each of them; this is the law of constant proportions in the chemical bonding theory.
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