vacuum pump

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

Subjects: Chemistry — Physics.

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