NILERED / SCIENCE PHOTO LIBRARY NILERED / SCIENCE PHOTO LIBRARY
Pouring liquid iodine. Liquid iodine being poured between laboratory beakers to demonstrate that iodine can form a liquid phase (purple), as well as a grey-black solid and a purple gas. Iodine at room temperature is a 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). Iodine, found in seaweed and sea water, is an essential part of the diet.
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