Ah, the classic propagation of errors formula—you sum the squares of the relative errors in mass and volume, then take the square root. But in our unit, if the density error crosses 2%, the entire batch is held up, and I must re-measure with my old, stubborn Vernier calipers. My life is a series of tuning battles, not with a sitar, but with instrument zero-error, each miscalculation costing me overtime that could have gone towards my son's fees. So, while the formula is pristine, I say the real calculation is the percentage of your peace of mind that remains after the inspectors leave.
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