It's about as big as a Blood Donation
It's about nine-tenths as big as a STARBUCKS Venti Coffee
In other words, 0.50 liters is 0.850 times the size of a STARBUCKS Venti Coffee, and the size of a STARBUCKS Venti Coffee is 1.20 times that amount.A STARBUCKS Venti coffee drink measures 0.590 liters. 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, 0.50 liters is 1.52109660 times the size of a Baseball (packed), and the size of a Baseball (packed) is 0.657420440 times that amount.(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 0.201733340 liters and 0.219015750 liters. 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, 0.50 liters is 2.3767133760 times the size of a Baseball, and the size of a Baseball is 0.42074909410 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 0.20173334160 liters and 0.21901575260 liters. 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, 0.50 liters is 3.1750 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.3150 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 0.15750 liters. 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, 0.50 liters is 0.30640 times the size of an Ostrich Egg, and the size of an Ostrich Egg is 3.2640 times that amount.(Struthio camelus) (for common ostrich; average)
The largest egg produced by living birds, ostrich eggs measure about 1.6 L in volume. The eggs take about nine weeks to hatch, with males and females taking turns incubating them.