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How big is 255.6 pinches?

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It's about as big as a Tennis Ball.
In other words, the size of a Tennis Ball is 1 times 255.6 pinches.
(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 255.6 pinches. 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, 255.6 pinches is 0.7485651049 times the size of a Baseball, and the size of a Baseball is 1.335889148 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 327.427958 pinches and 355.4785743 pinches. 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, 255.6 pinches is 1.359531366 times the size of a Puck (Hockey), and the size of a Puck (Hockey) is 0.7355475754 times that amount.
(Ice hockey)
standard ice hockey puck measures about 188.0059603 pinches. 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, 255.6 pinches is 0.47908167 times the size of a Baseball (packed), and the size of a Baseball (packed) is 2.0873268 times that amount.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 327.42796 pinches and 355.47857 pinches. 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 255.6 pinches.
(hen; USDA large size; uncooked)
A typical egg — of large size as defined by the United State Department of Agriculture — has a volume of 110 pinches. 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, 255.6 pinches is 2.47728019 times the size of a Golf Ball (packed), and the size of a Golf Ball (packed) is 0.403668509 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 66.0331056 pinches. 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.
In other words, the size of a Blood Donation is 3 times 255.6 pinches.
(American Red Cross donation volume)
The typical donation amount when giving blood is about 800 pinches. Donated quantities of blood typically have a viable shelf life of about 42 days.