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Chemistry

Tusi contributed to the field of chemistry, stating an early law of conservation of mass. Al-Tusi's theory of chemical transformation was based on the idea that substances could be transformed into other substances through chemical reactions, but that the total mass of the substances involved in the reaction would remain constant. This idea was a precursor to the law of conservation of mass, which states that the total mass of a closed system remains constant during a chemical reaction. Al-Tusi believed that chemical transformations were governed by natural laws and that they could be understood through observation, experimentation, and logical reasoning.