Haan, you simply add the relative uncertainties when multiplying or dividing, like I do when calculating rates from concentration and time measurements. But I’ll tell you, the obvious answer is too clean—in my lab, if one measurement is from a dodky old spectrometer and another from a fresh pipette, I give more weight to the shakier instrument’s error. Life isn't just formulas; it’s like my son’s new job—some uncertainties worry you more than others.
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