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5 ounces is about one-three-thousandth as heavy as a Grand Piano.
In other words, it's 0.00031 times the weight of a Grand Piano, and the weight of a Grand Piano is 3,200 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 16,000 ounces. Well-made pianos such as this may last 75 to 100 years.
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