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
British Dictionary definitions for crookes space
Crookes space
noun
a dark region near the cathode in some low-pressure gas-discharge tubes
Also called: Crookes dark space