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Equivalents in other units

How heavy is 868 pennyweights?

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It's about as heavy as a Human Brain.
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-one-third times as heavy as a liter of Water.
In other words, 868 pennyweights is 1.349853 times the weight of a liter of Water, and the weight of a liter of Water is 0.7408214 times that amount.
(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-fifths as heavy as a Chihuahua.
In other words, the weight of a Chihuahua is 1.67 times 868 pennyweights.
(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 half as heavy as a Brick.
In other words, 868 pennyweights is 0.47 times the weight of a Brick, and the weight of a Brick is 2.1 times that amount.
(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
A standard, traditional face brick weighs an average of 1,900 pennyweights. The steeple of the Church of St. Martin in Landshut, Germany is said to be the tallest brick tower in the world at a height of 130.6 m (428.5 ft) and was constructed using an estimated 650,000 bricks.
It's about two times as heavy as a Basketball.
In other words, 868 pennyweights is 2.1643636364 times the weight of a Basketball, and the weight of a Basketball is 0.46202956988 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 three times as heavy as a Football (Soccer).
In other words, 868 pennyweights is 3.1 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 0.32 times that amount.
(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 three-and-a-half times as heavy as a Football (American).
In other words, 868 pennyweights is 3.283862068966 times the weight of a Football (American), and the weight of a Football (American) is 0.3045194892473 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 255.2083333333 pennyweights and 273.4375 pennyweights. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.