While there are some facilities where hydrogen (H₂) is produced and consumed entirely within the fence line, most participants in the growing H₂ value chain engage in some combination of production, storage, transportation or consumption. Consequently, H₂ frequently changes hands as it moves from one stage to the other, perhaps multiple times, along the links of the larger value chain. Even where all these activities take place in one location, it is necessary to measure and quantify flows throughout the process for control and other internal purposes.

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