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Crookes dark space

noun, Physics.
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 of Crookes dark space
First recorded in 1890-95; after Sir W. Crookes Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for crookes space

Crookes space

a dark region near the cathode in some low-pressure gas-discharge tubes Also called Crookes dark space
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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