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  1. #1 question 
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    what kind of a pump is used in creating vacuum in vacuum flasks or thermose. Diffusion pump, Roots Blower, Rotary vane pump


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  3. #2 Re: question 
    Forum Professor leohopkins's Avatar
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    Quote Originally Posted by mihov123
    what kind of a pump is used in creating vacuum in vacuum flasks or thermose. Diffusion pump, Roots Blower, Rotary vane pump
    looks like a homework question to me.

    why dont you google it?


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