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          “PPM”和“LEL”又是什么?

          發布日期: 2020-01-02

          “PPM”和“LEL”又是什么?

          “PPM”是體積比濃度?!癙PM”是溶液濃度的一種表示方法, PPM 表示百萬分之一。對于溶液:即1升水溶液中有1/1000毫升的溶質,則其濃度為1 PPM 。

          “LEL"是指爆炸下限??扇細怏w在空氣中遇明火種爆炸的最低濃度,稱為爆炸下限—簡稱%LEL。


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