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How big is 500 milliliters?

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It's about as big as a Blood Donation.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 500 milliliters. Donated quantities of blood typically have a viable shelf life of about 42 days.
It's about nine-tenths as big as a STARBUCKS Venti Coffee.
In other words, 500 milliliters is 0.85 times the size of a STARBUCKS Venti Coffee, and the size of a STARBUCKS Venti Coffee is 1.2 times that amount.
A STARBUCKS Venti coffee drink measures 590 milliliters. The name of the size, Venti, is the Italian word for twenty.
It's about one-and-a-half times as big as a Baseball (packed).
In other words, 500 milliliters is 1.5210966 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.65742044 times that amount.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 201.73334 milliliters and 219.01575 milliliters. A major league pitcher can throw a fastball at up to 150 kph (91 mph).
It's about two-and-a-half times as big as a Baseball.
In other words, 500 milliliters is 2.376713376 times the size of a Baseball, and the size of a Baseball is 0.4207490941 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 201.7333416 milliliters and 219.0157526 milliliters. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
It's about three times as big as a Tennis Ball.
In other words, 500 milliliters is 3.175 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.315 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must measure 6.54 cm to 6.86 cm in diameter, for a total volume of 157.5 milliliters. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about three-tenths as big as an Ostrich Egg.
In other words, 500 milliliters is 0.3064 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 3.264 times that amount.
(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 1,600 milliliters in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.
It's about three-tenths as big as a Human Stomach.
In other words, the size of a Human Stomach is 3 times 500 milliliters.
(human; adult)
An average adult human stomach has a volume of about 2,000 milliliters. A newborn baby has a stomach capacity of just 30 mL.