When you set sugar on fire, it loses its form, going from solid crystals to a dense liquid. It also changes in color, going from white to deep brown. When you burn a plastic bag, it (sort of) melts and blackens.
When you set sugar on fire, it loses its form, going from solid crystals to a dense liquid. It also changes in color, going from white to deep brown. When you burn a plastic bag, it (sort of) melts and blackens.