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31,000,000 grains is about one-one-hundred-thousandth as heavy as The Sears Tower
In other words, it's 0.0000099540 times the weight of The Sears Tower, and the weight of The Sears Tower is 100,500 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 3,114,000,000,000 grains. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
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