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nature : in the normal boiling point (444.6 ° C), sulfur gas is orange yellow, elevated temperature, into a dark red color, and then lighter, until 650 ° C was yellow. The sulfur gas, S8, S6, S4 and S2 several different elements in a state of equilibrium, with its proportion of temperature change. In the normal boiling point, most of the sulfur vapor S8; At 750 ° C, most of S2; In 2000 ° C sulfur molecular decomposition of most of sulfur atoms. When the sulfur from the high-temperature sulfur vapor to form S2) quenching of -195 ° C, forming unstable purple sulfur, when heated to room temperature, changed again, back to yellow sulfur side of the ramp.
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