Correction for the weight of a Gold Bar
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How heavy is 0.000000000200 megatonnes?
It's about one-sixtieth as heavy as a Gold Bar
The weight of a Gold Bar is about 0.000000012441390720 megatonnes.
(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.