KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
LIBRARY Water molecule. Computer-generated model of a molecule of water (H2O). Water consists of an atom of oxygen (red) bonded covalently to two atoms of hydrogen (blue). It is the simplest oxygen hydride. It forms a colourless, odourless and tasteless liquid at 0 degrees Celsius and boils to water vapour at 100 degrees Celsius. Water makes up 60- 70% of the human body. Most of the world's water is in the sea; less than 0.01% is fresh water.
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