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How big is 1 gallons?

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It's about four-fifths as big as The Blood in a Human Body
In other words, the size of The Blood in a Human Body is 1 times 1 gallons.
(for 70 kg body; average altitude; average)
The volume of blood in the average human body is about 1 gallons. Persons living at high altitude, however, may have up to an additional 0.50 gallons of blood to compensate for the lower oxygen level.
It's about seven-tenths as big as a Bowling Ball
In other words, 1 gallons is 0.718383883170 times the size of a Bowling Ball, and the size of a Bowling Ball is 1.39201341150 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 1.39201341150 gallons. 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 half as big as a Basketball
In other words, 1 gallons is 0.532840132640 times the size of a Basketball, and the size of a Basketball is 1.87673551360 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 1.87673551360 gallons. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
It's about two times as big as a Human Stomach
In other words, the size of a Human Stomach is 0.50 times 1 gallons.
(human; adult)
An average adult human stomach has a volume of about 0.50 gallons. A newborn baby has a stomach capacity of just 0.008 gallons.
It's about half as big as a Bowling Ball (packed)
In other words, 1 gallons is 0.459765685230 times the size of a Bowling Ball (packed), and the size of a Bowling Ball (packed) is 2.17502095550 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 1.39201341150 gallons. 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-and-a-half times as big as an Ostrich Egg
In other words, 1 gallons is 2.3190 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 0.43120 times that amount.
(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 0.42270 gallons in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.
It's about one-third as big as a Basketball (packed)
In other words, 1 gallons is 0.341017684870 times the size of a Basketball (packed), and the size of a Basketball (packed) is 2.93239924020 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 1.87673551360 gallons. These balls have 4,118 pebbles each with a diameter of 2.5 mm