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521 kilograms is about 9,000,000,000 times as heavy as a Grain of Salt.
In other words, it's 8,910,000,000 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.0000000001120 times that amount.
The mass of a grain of salt is approximately 0.00000005850 kilograms. Salt consumption varies widely by country; the people of the United States consume a combined total of about 2,730,000 kilograms of salt each year.
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