RICHARD MEGNA / FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY RICHARD MEGNA / FUNDAMENTAL PHOTOS / SCIENCE PHOTO LIBRARY
Demonstration of sublimation, the action of passing directly from solid to gas without an intermediate liquid phase. Crystals of iodine at the bottom of the beaker are heated using a bunsen burner. A purple vapour of gaseous iodine is evolved which rises before re-crystallizing on the cooler parts of the beaker, leaving a dark deposit.
Model release not required. Property release not required.