Correction for the weight of a Grand Piano
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How heavy is 0.0028 pennyweights?
It's about 0.000000010 times as heavy as a Grand Piano
The weight of a Grand Piano is about 290,000 pennyweights.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 290,000 pennyweights. Well-made pianos such as this may last 75 to 100 years.