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
Picture: SPL/Barcroft Media
Images of Big Bang experiments inside particle accelerators at CERN - Telegraph
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