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  2. Certified reference materials - Wikipedia

    en.wikipedia.org/wiki/Certified_reference_materials

    [21]: 119–124 For example, stabilizing agents such as antioxidants or antimicrobial agents may be added to prevent degradation, liquids containing certified concentrations of trace metals may have pH adjusted to keep metals in solution, and clinical reference materials may be freeze-dried for long term storage if they can be reconstituted ...

  3. DM3 density meter - Wikipedia

    en.wikipedia.org/wiki/Dm3_density_meter

    This in-line section of pipe calculates the percentage of dry solids, wet density or wet and dry mass flow units. When coupled with compatible volumetric flow meters and processing units, this system gives a true value for density and mass flow. [2] The DM3 is a bi-directional unit which allows media to flow continuously through either ends.

  4. Flow measurement - Wikipedia

    en.wikipedia.org/wiki/Flow_measurement

    A rotameter is an example of a variable area meter, where a weighted "float" rises in a tapered tube as the flow rate increases; the float stops rising when area between float and tube is large enough that the weight of the float is balanced by the drag of fluid flow.

  5. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    The four primary reasons for calibrations are to provide traceability, to ensure that the instrument (or standard) is consistent with other measurements, to determine accuracy, and to establish reliability. [2] Traceability works as a pyramid, at the top level there is the international standards, which beholds the world's standards.

  6. Mass flow meter - Wikipedia

    en.wikipedia.org/wiki/Mass_flow_meter

    The mass flow rate is the mass of the fluid traveling past a fixed point per unit time. The mass flow meter does not measure the volume per unit time (e.g. cubic meters per second) passing through the device; it measures the mass per unit time (e.g. kilograms per second) flowing through the device. Volumetric flow rate is the mass flow rate ...

  7. Custody transfer - Wikipedia

    en.wikipedia.org/wiki/Custody_transfer

    Flow is measured using Coriolis meters by analyzing the changes in the Coriolis force of a flowing substance. The force is generated in a mass moving within a rotating frame of reference. An angular, outward acceleration , which is factored with linear velocity is produced due to the rotation.

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