NILERED / SCIENCE PHOTO LIBRARY NILERED / SCIENCE PHOTO LIBRARY
Solid iodine being poured from a bottle onto a white surface in a laboratory. Iodine at room temperature is a grey-black solid. Gentle heating (not shown here) below the melting point results in the formation of a purple gas. This solid-gas transition is known as sublimation. Iodine, found in seaweed and sea water, is an essential part of the diet.
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