a device that enables the tracks of ionizing particles to be photographed as a row of bubbles in a superheated liquid. Immediately before the particles enter the chamber the pressure is reduced so that the ionized particles act as centres for small vapour bubbles
bubble chamber in American English
US
a container filled with a superheated, transparent liquid in which charged atomic particles and their collisions can be studied by photographing the bubbles and violent boiling that occur along their paths