| 单词 | hard vacuum |
| 释义 | > as lemmashard vacuum 25. Physics. Of a vacuum: containing very little air or gas; almost complete; (of a vacuum tube or thermionic valve) containing such a vacuum; chiefly in hard vacuum.See also hard tube n., hard valve n. at Compounds 4. ΘΚΠ the world > matter > gas > air > [adjective] > under pressure > in which a vacuum has been produced > complete or incomplete vacuum hard1898 rough1900 1898 Science 22 Apr. 565/1 Professor Röntgen has made..a third communication on the X-rays... The same body has different transparencies with different tubes, ‘soft tubes’ being those requiring a small potential and ‘hard tubes’ those requiring a high one. 1931 R. L. Duncan & C. E. Drew Radio Telegr. & Telephony (ed. 2) 214 The degree of vacuum in the tube would change and some tubes became soft (having less vacuum) while others became hard (having a higher vacuum, with little or no gas present). 1945 Astounding Sci.-Fiction May 9/2 A ship traveling on overdrive—above the speed of light—does not want to hit even a merely hard vacuum. 1981 V. N. McIntyre Entropy Effect vii. 182 This felt as if he were falling through space, through hard vacuum, buffeted by every eddy of the solar wind. 2007 Pittsburgh (Pa.) Post-Gaz. (Nexis) 25 Oct. f7 Humans face many hazards while living and working in the dangerous and unforgiving environment of space. Some of the hazards are obvious: hard vacuum, extreme cold and radiation from the sun. < as lemmas |
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