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单词 pump-down
释义

pump-downn.

Brit. /ˈpʌmpˌdaʊn/, U.S. /ˈpəmpˌdaʊn/
Origin: Formed within English, by conversion. Etymon: English to pump down.
Etymology: < to pump down (see pump v. 3a).
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).
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n.1948
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