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How heavy is 25.50 monme (匁)?

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It's about as heavy as a Deck of Cards.
(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).
It's about seven-tenths as heavy as a Battery (D).
In other words, 25.50 monme (匁) is 0.7080 times the weight of a Battery (D), and the weight of a Battery (D) is 1.410 times that amount.
(Alkaline)
A "D" size battery weighs 36 monme (匁). The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about one-and-a-half times as heavy as a Battery (C).
In other words, the weight of a Battery (C) is 0.670 times 25.50 monme (匁).
(Alkaline)
A "C" size battery weighs 17 monme (匁). C batteries are typically used in medium-drain devices such as musical instruments.
It's about two-thirds as heavy as a Baseball.
In other words, 25.50 monme (匁) is 0.658160509547050 times the weight of a Baseball, and the weight of a Baseball is 1.51938620669930 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 37.7993641666670 monme (匁) and 39.6893323750 monme (匁). A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about one-and-two-thirds times as heavy as a Tennis Ball.
In other words, the weight of a Tennis Ball is 0.6020 times 25.50 monme (匁).
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 15.40 monme (匁). Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about three-fifths as heavy as a Billiard Ball.
In other words, 25.50 monme (匁) is 0.586621323726720 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 1.70467720751630 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 41.5793005833330 monme (匁) and 45.3592370 monme (匁). According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about three-fifths as heavy as a Puck (Hockey).
In other words, 25.50 monme (匁) is 0.586621323726720 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 1.70467720751630 times that amount.
(Ice hockey)
A standard ice hockey puck weighs between 41.5793005833330 monme (匁) and 45.3592370 monme (匁). Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.