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~1/2 pound

First, note that 1 gram was originally defined to be the weight of one milliliter of ice water, so it is a good approximation of water weight (and mass).

Second we need milliliters of water in a cup:

There are 8 fluid ounces in a cup (that's *fluid* ounces, a measure of volume, not ounces, a measure of weight)

1 US fluid ounces = 29.5735296 milliliters x 8 fl. oz / cup= 236.588237 milliliters in a cup

By the above approximation, 1 cup, therefore, weighs 236.6 grams

236.6 grams = 0.521613712 pounds which equals approximately 1/2 pound.

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