Correction for the weight of a Deck of Cards
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How heavy is 489.450 monme (匁)?
It's about twenty times as heavy as a Deck of Cards
The weight of a Deck of Cards is about 25 monme (匁).
(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 25 monme (匁). Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 61,000 monme (匁).