Aston dark space

Aston dark space

noun Physics.
the dark region between the cathode and the cathode glow in a vacuum tube, occurring when the pressure is low.

Origin:
named after F. W. Aston
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Aston dark space is always a great word to know.
So is compressibility. Does it mean:
the branch of physics that deals with sound and sound waves
the reciprocal of the bulk modulus, equal to the ratio of the fractional change in volume to the stress applied to a body
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