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0.000000000000000300 megatonnes is about five times as heavy as a Grain of Salt
In other words, it's 5.130 times the weight of a Grain of Salt, and the weight of a Grain of Salt is 0.1950 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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