Carl from Austin, TX wrote:
" … The stuff I buy at the
store claims to be pre-sifted, but I can tell that it’s denser before I sift it than after, so the measurements would be off."
Hello??? I don’t know what kind of scales you use in Texas, but they must be pretty fancy if they can differentiate on the basis of the density of the ingredients! I would venture that 1kg of flour would still weigh 1kg even after you’d sifted it (unless you’re incedibly clumsy and spilt most of it )
At the risk of proposing a semi-sensible answer, I thought it was to do with getting more air into your ingredients/mixture which helps it rise during baking. Anyway, the answers from the SDStaff make for amusing reading …