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0.0000000300 megatonnes is about two-and-a-half times as heavy as a Gold Bar
In other words, it's 2.4113059930 times the weight of a Gold Bar, and the weight of a Gold Bar is 0.41471302390 times that amount.
(London Good Delivery bar)
A "London Good Delivery" gold bar — the variety commonly held by Central Banks — should weigh 0.000000012441390720 megatonnes. The largest gold bar ever produced was minted by Mitsubishi Materials Corporation (a sibling company of the auto manufacturer) in 2005 and weighed 0.000000250 megatonnes.
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