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It depends on grain size, which can be as small as 0.004 inch or as big as 0.1 inch. If we take an average grain size of 0.02 inch diameter that is 0.00000043 cubic inch volume and a cubic foot is 1728 cubic inches then (not considering packing voids) that is 1728/.000000 = 4 billion grains!

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That can vary a lot, depending on whether you have fine sand or course sand.

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9y ago
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Q: How many sand grains is in a cubic ft?
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