When do I use Δ(AB)/AB = ΔA/A + ΔB/B in Units, Dimensions & Measurement, and what does it mean?
the fractional error of a product equals the sum of fractional errors.
Δ(AB)/AB = ΔA/A + ΔB/B — the fractional error of a product equals the sum of fractional errors. Use it when: combining independently-measured quantities. Always check the condition holds before plugging in numbers.
Key point
Δ(AB)/AB = ΔA/A + ΔB/B
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