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10,000,000 grains is about one-and-two-fifths times as heavy as a Grand Piano
In other words, the weight of a Grand Piano is 0.710 times that amount.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 6,900,000 grains. Well-made pianos such as this may last 75 to 100 years.
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