# Sensitivity-based uncertainty propagation
# Scope: Independent first-order uncertainty of a product.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

a = 10 mm
b = 20 mm
sigmaA = 0.1 mm
sigmaB = 0.2 mm

product := a*b [mm^2]
sigma := sqrt((b*sigmaA)^2+(a*sigmaB)^2) [mm^2]

check relative uncertainty budget: sigma/product <= 0.02

scenario alternative: a = 8 mm