Units and conversions

You buy wax by the pound and use it by the gram — Batchnook converts between units in the same family (mass, volume, count) automatically, so a recipe in grams costs correctly from a purchase in pounds.

Crossing families — grams to millilitres, say — needs a density, because there is no honest guess otherwise. If a recipe line needs one, Batchnook flags it and asks; it never invents a conversion.

Set a material once and every recipe that uses it stays right.