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How heavy is 320.01 firkins?

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It's about 80,000 times as heavy as a Billiard Ball.
In other words, 320.01 firkins is 80,141.634782609 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.000012477908676465 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.0038194444444444 firkins and 0.0041666666666667 firkins. 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 80,000 times as heavy as a Puck (Hockey).
In other words, 320.01 firkins is 80,141.634782609 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.000012477908676465 times that amount.
(Ice hockey)
A standard ice hockey puck weighs between 0.0038194444444444 firkins and 0.0041666666666667 firkins. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 90,000 times as heavy as a Baseball.
In other words, 320.01 firkins is 89,915.004878049 times the weight of a Baseball, and the weight of a Baseball is 0.00001112161425511 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.0034722222222222 firkins and 0.0036458333333333 firkins. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch).
It's about 95,000 times as heavy as a Battery (D).
In other words, 320.01 firkins is 96,800 times the weight of a Battery (D), and the weight of a Battery (D) is 0.0000103 times that amount.
(Alkaline)
A "D" size battery weighs 0.00331 firkins. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about 150,000 times as heavy as a Deck of Cards.
In other words, the weight of a Deck of Cards is 0.0000071 times 320.01 firkins.
(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 0.0023 firkins. 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 5.6 firkins.
It's about 200,000 times as heavy as a Battery (C).
In other words, the weight of a Battery (C) is 0.000005 times 320.01 firkins.
(Alkaline)
A "C" size battery weighs 0.0016 firkins. C batteries are typically used in medium-drain devices such as musical instruments.
It's about 250,000 times as heavy as a Tennis Ball.
In other words, 320.01 firkins is 226,000 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.00000442 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00141 firkins. 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.