单词 | pump-down |
释义 | pump-downn. Mechanics and Engineering. The action or process of reducing the pressure of air or other gas inside an enclosed volume by pumping. ΘΚΠ the world > matter > gas > [noun] > reducing pressure of by pumping pump-down1948 the world > matter > gas > air > [noun] > air-pressure > pressurization of air or gas > decompression or recompression recompression1864 decompression1905 pump-down1948 1948 Rev. Sci. Instruments 19 13/1 To obtain a conservative value for the ‘pump-down’ time, the pump speed..is 0·37 liter per second. 1966 D. G. Brandon Mod. Techniques Metallogr. 184 Preliminary pump-down can be performed with a liquid nitrogen-cooled sorption trap. 2003 Ann. Bot. 92 75/1 The most successful technique involved..excess water on the stage to ensure water was present during pumpdown. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1948 |
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