| 单词 | vacuum pump |
| 释义 | vacuum pump A pump used to reduce the gas pressure in a container. The normal laboratory rotary oil-seal pump can maintain a pressure of 10-1Pa. For pressures down to 10-7Pa a diffusion pump is required. Ion pumps can achieve a pressure of 10-9Pa and a cryogenic pump combined with a diffusion pump can reach 10-13Pa |
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