PATRICE LOIEZ, CERN / SCIENCE PHOTO LIBRARY PATRICE LOIEZ, CERN / SCIENCE PHOTO LIBRARY
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Subatomic particle tracks. Coloured bubble chamber photograph showing tracks of subatomic particles, notably the tightly-wound spirals of electrons and positrons. A bubble chamber is a container filled with liquid hydrogen which is superheated - momentarily raised above its normal boiling point by a sudden drop in pressure in the container. Any charged particle passing through the liquid in this state leaves behind a trail of tiny bubbles as the liquid boils in its wake. These bubbles are seen as fine tracks, showing the characteristic paths of different types of particle. The paths are curved due to an intense applied magnetic field.
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