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    Ppm

    Oct 15, 2025 by Mario Pettene

    A unit of concentration expressed as parts per million. Equivalent to 1 x 10⁻⁶.

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    ERICA Project – No 2023-1-NL01-KA220-ADU-000154929
    Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.

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