RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Water molecule, computer artwork. Water molecules are formed of a single oxygen atom (red) and two hydrogen atoms (green), bonded covalently. At normal pressure, water freezes into ice at 0 degrees Celsius and boils into steam at 100 degrees Celsius. Between these temperatures it is a colourless liquid. It is the most abundant molecule on Earth, covering almost 75 per cent of its surface and also present as vapour in the atmosphere.
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