Assertion: blast furnace | /r/Desires | the fact
Facets:
Source sentences:
text: A blast furnace relies on the fact that the unwanted silicon and other impurities are lighter than the molten iron that is the main product.
text: The blast furnace relied on the fact that the unwanted sulfur-iron compounds were lighter than the pure iron and iron-carbon mix, pig iron, that was its main product.