NILERED / SCIENCE PHOTO LIBRARY NILERED / SCIENCE PHOTO LIBRARY
Phases of iodine. Time-lapse footage of iodine in a beaker being heated to produce a purple gas. At top, crystals of iodine form on the underside of a round-bottom flask filled with cold water as the gas deposits to re-form into a solid. Iodine at room temperature is a grey-black solid. Gentle heating below the melting point drives a solid-gas transition known as sublimation. Further heating results in the iodine melting (at 113 degrees Celsius). Boiling takes place at 184 degrees Celsius. Iodine, found in seaweed and sea water, is an essential part of the diet.
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