Encara no tenim significats per a "fusible substance".
1There is also added some more fusible substance, such as feldspar, gypsum, or lime, together with some pure quartz.
2Consequently, this fixed substance, which is now, properly speaking, a perfect coal, had been originally an oily bituminous or fusible substance.
3Although it is a very difficultly fusible substance, yet in the electric furnace it can be made to melt and even boil.
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