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How heavy is 0.310 kilograms?

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It's about as heavy as a Human Heart.
(human; adult)
The average human heart weighs about 0.310 kilograms. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.
It's about nine-tenths as heavy as a Can of Soup.
In other words, 0.310 kilograms is 0.890 times the weight of a Can of Soup, and the weight of a Can of Soup is 1.10 times that amount.
(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 0.350 kilograms. 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.
It's about three-fourths as heavy as a Football (American).
In other words, 0.310 kilograms is 0.75413297961170 times the weight of a Football (American), and the weight of a Football (American) is 1.3260260816530 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.396893323750 kilograms and 0.4252428468750 kilograms. 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 seven-tenths as heavy as a Football (Soccer).
In other words, 0.310 kilograms is 0.720 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 1.40 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 0.410 kilograms and 0.450 kilograms. 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 one-and-nine-tenths times as heavy as a Billiard Ball.
In other words, 0.310 kilograms is 1.90172664423820 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.525837928931460 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 one-and-nine-tenths times as heavy as a Puck (Hockey).
In other words, 0.310 kilograms is 1.90172664423820 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.525837928931460 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 two times as heavy as a Hamster.
In other words, the weight of a Hamster is 0.50 times 0.310 kilograms.
(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.20 kilograms. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 25 kg of food in their borrows.