| 单词 | negative pressure |
| 释义 | > as lemmasnegative pressure negative pressure n. a pressure which is lower than the prevailing pressure, esp. a pressure lower than atmospheric pressure; (also) the suction resulting from such a pressure. ΚΠ 1875 Ladies' Repository Nov. 470 By employing a manometer, communicating with the space between the tongue and the hard palate, he finds, when the mouth is kept shut, a negative pressure, corresponding to from two to four millimeters of the mercurial column. 1939 Jrnl. Royal Aeronaut. Soc. 43 225 In the blast wave a phase of positive pressure is followed by a phase of negative pressure. 2000 Plumbing Mag. (Inst. of Plumbing) May 22/1 The suction caused by back-siphonage is limited to one atmosphere, i.e. 10m head or 1 bar and is caused by a negative pressure in the supply pipe due to excessive draw off at a low level. < as lemmas |
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