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1. Law Of Conservation Of Mass

   Linked via "closed vessels"

   Before the late 18th century, chemical thought was dominated by the phlogiston theory, which posited the existence of an invisible, fire-like element called phlogiston that was released during combustion and calcination (oxidation). Under this paradigm, the mass of a substance often decreased upon burning, a phenomenon explained by the release of phlogiston. For instance, wood, upon burning, yielded ash, which weighed less than the original wood, implying a significant loss of material substan…