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How heavy is 643.0329 pennyweights?

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It's about as heavy as a liter of Water.
In other words, the weight of a liter of Water is 1 times 643.0329 pennyweights.
(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 643.0329 pennyweights rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about three-fourths as heavy as a Human Brain.
In other words, 643.0329 pennyweights is 0.7410 times the weight of a Human Brain, and the weight of a Human Brain is 1.350 times that amount.
(adult)
The average weight of an adult human brain is between 868 pennyweights. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.
It's about one-and-three-fifths times as heavy as a Basketball.
In other words, 643.0329 pennyweights is 1.60340671170 times the weight of a Basketball, and the weight of a Basketball is 0.623672080640 times that amount.
(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 401.04166667 pennyweights. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about two-fifths as heavy as a Chihuahua.
In other words, 643.0329 pennyweights is 0.4440 times the weight of a Chihuahua, and the weight of a Chihuahua is 2.250 times that amount.
(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 1,450 pennyweights. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.
It's about two-and-a-half times as heavy as a Football (Soccer).
In other words, the weight of a Football (Soccer) is 0.430 times 643.0329 pennyweights.
(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 260 pennyweights and 290 pennyweights. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
It's about two-and-a-half times as heavy as a Football (American).
In other words, 643.0329 pennyweights is 2.4327550108370 times the weight of a Football (American), and the weight of a Football (American) is 0.41105659860750 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 255.20833333330 pennyweights and 273.43750 pennyweights. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about three times as heavy as a Can of Soup.
In other words, 643.0329 pennyweights is 2.90 times the weight of a Can of Soup, and the weight of a Can of Soup is 0.340 times that amount.
(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 230 pennyweights. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.