MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY
Water and ice molecular structure. Computer illustration comparing the structure of molecules of liquid water (bottom) with that of ice (frozen water, top). When water freezes (solidifies) the water molecules (red/white) arrange themselves in a regular hexagonal crystal lattice structure (top right). This holds them further apart than in liquid water (bottom left) and means that ice has a lower density than water, causing it to float.
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