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Crookes dark space

noun, Physics.
1.
the dark space between the cathode glow and the negative glow in a vacuum tube, occurring when the pressure is low.
Also called Crookes space.
Origin
1890-1895
1890-95; after Sir W. Crookes
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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