| 单词 | roughing pump |
| 释义 | > as lemmasroughing pump roughing pump n. a pump for evacuating a system from atmospheric pressure to a lower pressure at which a second pump can begin to operate. ΘΚΠ society > occupation and work > equipment > pump > [noun] > pumps for producing vacua vacuum pump1858 mercury pump1869 pulsometer1873 mercury vapour pump1926 roughing pump1958 1907 U.S. Patent 866,751 1/1 It is desirable that the bulk of the atmosphere be removed by a primary or roughing pump. 1958 Rev. Sci. Instruments 29 368/1 With the roughing pump pinched off..and the system then thoroughly baked out while pumping with the electronic pump, very low pressures can be achieved. 2004 S. Franssila Introd. Microfabrication xxxii. 323/1 The pumping speed of a mechanical roughing pump gets worse at lower pressures. < as lemmas |
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