Imagine a vessel containing whole grains with spaces between them. Finely milled flour may pack more densely into the same vessel. Both vessels can read one saʿ while containing different quantities of the underlying substance.
The problem is not an assertion that flour always weighs a particular amount. It is the failure to establish reliable equality under the relevant classical volumetric measure. Substituting equal weights alone does not automatically settle that juridical test.
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Riba in Particular Exchanges: Flour, Meat, Dates, Oils and Composite Goods
Imagine a vessel containing whole grains with spaces between them. Finely milled flour may pack more densely into the same vessel. Both vessels can read one saʿ while containing different quantities of the underlying substance.
The problem is not an assertion that flour always weighs a particular amount. It is the failure to establish reliable equality under the relevant classical volumetric measure. Substituting equal weights alone does not automatically settle that juridical test.