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0.0000000000000006250 megatonnes is about ten-and-a-half times as heavy as a Grain of Salt
In other words, the weight of a Grain of Salt is 0.0935 times that amount.
The mass of a grain of salt is approximately 0.00000000000000005850 megatonnes. Salt consumption varies widely by country; the people of the United States consume a combined total of about 0.00273 megatonnes of salt each year.
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