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That depends on what substance you are measuring. Grams are a unit of weight, while cups are a unit of volume. There will be more grams in a cup of a more dense substance than there would be in a less dense substance. For example, there will be more grams in a cup of rocks than a cup of marshmellows, more grams in a cup of water than a cup of air, etc. To convert from a unit of weight (mass) to a unit of volume (or vice versa), you need to know the density of the substance being measured.

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12y ago

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