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並前往https://www.gasdetection.com/gas-detection-knowledge-base/calculations-and-conversions/one-more-reason-to-use-ppm-or-ppb/

One more reason to use ppm or ppb - Interscan Corporation

The main difficulty is that the ppm measuring unit is unaffected by temperature ... Moral of the story: Use ppm or ppb when designating a gas concentration.

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