Minimum weighing is the smallest amount of sample required for a weighing operation to be consistent with a specific relative weighing accuracy.
Consequently, when weighing a quantity representing a minimum weighing, P
min
, the relative measurement uncertainty of the weighing is equal to the required weighing accuracy, Need, so that U(P
min
)/P
min
= Need. This yields the equation
(9)
which is used to determine the minimum weight:
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