It's about as big as a Tennis Ball.
(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 511.3 dashes. 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-fourths as big as a Baseball.
In other words, 511.3 dashes is 0.7487115378 times the size of a Baseball, and the size of a Baseball is 1.335627875 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 654.8559161 dashes and 710.9571485 dashes. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
It's about one-and-one-third times as big as a Puck (Hockey).
In other words, 511.3 dashes is 1.359797315 times the size of a Puck (Hockey), and the size of a Puck (Hockey) is 0.7354037171 times that amount.(Ice hockey)
standard ice hockey puck measures about 376.0119207 dashes. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about half as big as a Baseball (packed).
In other words, 511.3 dashes is 0.47917538 times the size of a Baseball (packed), and the size of a Baseball (packed) is 2.0869186 times that amount.(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 654.85592 dashes and 710.95715 dashes. 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 an Egg (Chicken).
In other words, the size of an Egg (Chicken) is 0.43 times 511.3 dashes.(hen; USDA large size; uncooked)
A typical egg — of large size as defined by the United State Department of Agriculture — has a volume of 220 dashes. Each year, American farms produce 69,000,000,000 eggs.
It's about two-and-a-half times as big as a Golf Ball (packed).
In other words, 511.3 dashes is 2.47776479 times the size of a Golf Ball (packed), and the size of a Golf Ball (packed) is 0.403589559 times that amount.(64% packing density) (per R&A-USGA Rules of Golf)
Dictated by the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), a golf ball must have a volume of at least 132.066211 dashes. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about three-tenths as big as a Blood Donation.