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How big is 12 cups?

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It's about as big as a Human Stomach.
(human; adult)
An average adult human stomach has a volume of about 8 cups. A newborn baby has a stomach capacity of just 0.10 cups.
It's about three-fifths as big as The Blood in a Human Body.
In other words, the size of The Blood in a Human Body is 2 times 12 cups.
(for 70 kg body; average altitude; average)
The volume of blood in the average human body is about 20 cups. Persons living at high altitude, however, may have up to an additional 8 cups of blood to compensate for the lower oxygen level.
It's about one-and-three-fourths times as big as an Ostrich Egg.
In other words, the size of an Ostrich Egg is 0.57470 times 12 cups.
(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 6.7630 cups in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.
It's about half as big as a Bowling Ball.
In other words, 12 cups is 0.538787912380 times the size of a Bowling Ball, and the size of a Bowling Ball is 1.8560178820 times that amount.
(USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 22.2722145850 cups. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about two-fifths as big as a Basketball.
In other words, 12 cups is 0.399630099480 times the size of a Basketball, and the size of a Basketball is 2.50231401810 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 30.027768218 cups. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
It's about one-third as big as a Bowling Ball (packed).
In other words, 12 cups is 0.344824263920 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 2.90002794070 times that amount.
(64% packing density) (USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 22.2722145850 cups. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about one-fourth as big as a Basketball (packed).
In other words, 12 cups is 0.255763263660 times the size of a Basketball (packed), and the size of a Basketball (packed) is 3.90986565350 times that amount.
(64% packing density) (NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball measures about 30.027768218 cups. These balls have 4,118 pebbles each with a diameter of 2.5 mm