Faraday dark space

Faraday dark space

noun Physics.
the dark region between the negative glow and the positive column in a vacuum tube occurring when the pressure is low.

Origin:
1890–95; named after M. Faraday
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Faraday dark space is always a great word to know.
So is gravitational field. Does it mean:
the attractive effect of matter on other matter; the region surrounding an astronomical body in which the force of gravitation is strong
a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities
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