dark space
noun
: any of several regions or layers in the visible-glow discharge of a gas-filled cold-cathode electron tube that remain nonluminous or exhibit low light intensity until the ions in such spaces acquire sufficient energy to excite fluorescence in the tube gas see aston dark space , crookes dark space , faraday dark space
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“Dark space.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dark%20space. Accessed 26 Nov. 2024.
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