# To show that the opposing theory infers a given proposition, and then to show definitively that that proposition is contrary to fact. For example, the [[phlogiston]] theory of fire held that a flammable substance always contained another substance, called "phlogiston," that actually burned. [[Antoine Lavoisier]] demonstrated a combustion reaction in which the solid products clearly weighed ''more'' than the initial fuel, a thing that the phlogiston theory could not possibly explain. | # To show that the opposing theory infers a given proposition, and then to show definitively that that proposition is contrary to fact. For example, the [[phlogiston]] theory of fire held that a flammable substance always contained another substance, called "phlogiston," that actually burned. [[Antoine Lavoisier]] demonstrated a combustion reaction in which the solid products clearly weighed ''more'' than the initial fuel, a thing that the phlogiston theory could not possibly explain. |