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How heavy is 450 kilograms?

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It's about 3,000 times as heavy as a Billiard Ball.
In other words, 450 kilograms is 2,760.57093518460 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.00036224390659722 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.15592237718750 kilograms and 0.170097138750 kilograms. 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 3,000 times as heavy as a Puck (Hockey).
In other words, 450 kilograms is 2,760.57093518460 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.00036224390659722 times that amount.
(Ice hockey)
A standard ice hockey puck weighs between 0.15592237718750 kilograms and 0.170097138750 kilograms. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about one-three-thousandth as heavy as a Tree (Sierra Redwood).
In other words, 450 kilograms is 0.00035 times the weight of a Tree (Sierra Redwood), and the weight of a Tree (Sierra Redwood) is 2,900 times that amount.
(a.k.a. Giant Sequoia, a.k.a. Sierran redwood, a.k.a. Wellingtonia, a.k.a. "Big Tree", Sequoiadendron giganteum)
The weight of wood in a Giant Sequoia is 1,300,000 kilograms. General Sherman, a specimen in Sequoia National Park in Visalia, California, is the largest tree in the world by volume, with an estimated weight of about 1,900,000 kilograms.
It's about 3,000 times as heavy as a Baseball.
In other words, 450 kilograms is 3,097.22592728020 times the weight of a Baseball, and the weight of a Baseball is 0.00032286956892361 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.1417476156250 kilograms and 0.148834996406250 kilograms. 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 3,500 times as heavy as a Battery (D).
In other words, 450 kilograms is 3,330 times the weight of a Battery (D), and the weight of a Battery (D) is 0.0003 times that amount.
(Alkaline)
A "D" size battery weighs 0.1350 kilograms. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about 5,000 times as heavy as a Deck of Cards.
In other words, the weight of a Deck of Cards is 0.00021 times 450 kilograms.
(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 0.094 kilograms. 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 272 kg.
It's about 7,000 times as heavy as a Battery (C).
In other words, 450 kilograms is 6,900 times the weight of a Battery (C), and the weight of a Battery (C) is 0.00014 times that amount.
(Alkaline)
A "C" size battery weighs 0.065 kilograms. C batteries are typically used in medium-drain devices such as musical instruments.