TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Iron nail in water. Experiment to show the corrosive effects of different combinations of water and air on iron. Here the nail is in a beaker full of water. Iron rusts (corrodes) in the presence of oxygen and water. Here the nail is rusting as water contains dissolved oxygen. Rust (iron oxide, brown) deposits can be seen at the bottom of the beaker.
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