| 单词 | dark space |
| 释义 | > as lemmasdark space dark space n. Physics a non-luminous area in a vacuum tube traversed by an electric discharge.Two such areas typically appear, the Crookes dark space and the Faraday dark space: see the first elements. ΚΠ 1838 M. Faraday in Philos. Trans. (Royal Soc.) 128 i. 138 A purple stream..appeared on the end of the positive rod..but never joining the negative glow, there being always a short dark space between. 1895 S. P. Thompson Elem. Lessons Electr. & Magn. (ed. 2) ii. iv. 307 The kathode exhibits a beautiful bluish or violet glow, separated from the conductor by a narrow dark space. 1920 Discovery July 217/1 The dark space around the negative pole, which has since been referred to as the Crookes or Cathode Dark Space. 2015 R. Wördenweber in P. Seidel Appl. Superconductivity I. iii. 262 The cathode fall potential increases rapidly with current, and the dark space shrinks. < as lemmas |
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