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39 grains is about half as heavy as a sheet of Paper.
In other words, the weight of a sheet of Paper is 2 times that amount.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 100,000 grains, 8.5 inch x 11 inch paper is 30,000 grains, each sheet weighing 80 grains. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
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