Hi Judith, you had me at "numerical fluid flow equations"! It is, indeed, a flawed formula that can still offer the bread baker some beneficial guidance when it comes to deciding on what water temperature to use. I find having done my own calculations a few times, that my intuition is a little more honed when it comes to what water temperature to use, even if I don't want to go to the trouble to do all the calculating. Thanks for sharing your expertise! Barb

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