I started
this thread to address this very issue. It does seem that bulk density, that is the density of powder or granules sold for dry chemicals, does mostly seem to be around 1.0 - 1.2 g/ml which is about 1.0 - 1.2 ounce weight per fluid ounce volume or 1.0 - 1.2 pound for TWO cups. So one cup is about 1/2 pound (0.5 - 0.6 pounds).
The best thing to do is to measure it on a scale, at least once, (subtracting out the weight of the cup, of course) and then report on the thread your results so others can know as well.
Richard
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