Crookes dark space

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:
1890–95; after Sir W. Crookes
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Crookes dark space is always a great word to know.
So is law of gravitation. Does it mean:
a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities
any two masses attract each other with a force equal to a constant, multiplied by the product of the two masses, divided by the square of the distance between them
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