cloud' cham"ber

an apparatus for determining the movements of charged particles, consisting of a chamber containing a supersaturated mixture of gas and vapor, the vapor condensing around ions created by the particle in its passing, thereby revealing the path of the particle. Also called expansion chamber, Wilson cloud chamber. Cf. bubble chamber.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

cloud-cappedcloud cover
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