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{{Short description|Round object}}
{{Otheruses}}
{{Other uses}}
'''Balls''' are objects typically used in games. They are usually ] but can be other shapes, such as ] (only in a few special cases) or solid (as in ]). In most ], the ] of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for more simple activities, such as, ], ] and ]. Balls made from hard-wearing ] are used in ] applications to provide frictionless ], known as ].
{{pp-semi-indef}}
{{pp-move}}
{{use mdy dates|date=May 2024}}
]


A '''ball''' is a round object (usually ], but can sometimes be ])<ref>{{cite web|url=https://books.google.com/books?id=gpZx5wQbxvMC&q=spherical+or+ovoid+ball&pg=PA404|title=Code of Federal Regulations: 1985–1999|date=5 November 1999|publisher=U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register|access-date=5 November 2017|via=Google Books|url-status=live|archive-url=https://web.archive.org/web/20171107021013/https://books.google.co.uk/books?id=gpZx5wQbxvMC&pg=PA404&dq=spherical+or+ovoid+ball&hl=en&sa=X&ved=0ahUKEwi-r96o96fXAhXEDsAKHTKcAr4QuwUIKDAA|archive-date=7 November 2017}}</ref> with several uses. It is used in ]s, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch or ]. Balls made from hard-wearing materials are used in ] applications to provide very low ] bearings, known as ]. ] weapons use stone and metal balls as ]s.
Although many types of balls are today made from ], this form was unknown outside the Americas until after the voyages of ]. The Spanish were the first to see bouncing rubber balls (albeit solid and not inflated) which were employed most notably in the ]. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials.

Although many types of balls are today made from ], this form was unknown outside the ] until after the voyages of ]. The Spanish were the first Europeans to see the bouncing rubber balls (although solid and not inflated) which were employed most notably in the ]. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials.

As balls are one of the most familiar spherical objects to humans, the word "ball" may refer to or describe spherical or near-spherical objects.

"Ball" is used metaphorically sometimes to denote something spherical or spheroid, e.g., ] and human beings curl up into a ball, making a fist into a ball.


== Etymology == == Etymology ==
The first known use of the word ''ball'' in English in the sense of a globular body that is played with was in 1205 in ''{{latinx|]}}'' in the phrase, "{{latinx|Summe heo driuen balles wide ȝeond Þa feldes.}}" The word came from the ] ''bal'' (inflected as ''ball-e, -es'' in turn from ] ''böllr'' (pronounced {{IPA|}}; compare Old Swedish ''baller,'' and Swedish ''boll'') from ] ''ballu-z,'' (whence probably Middle High German ''bal, ball-es,'' Middle Dutch ''bal''), a ] with ] ''ballo, pallo,'' Middle High German balle from Proto-Germanic ''*ballon'' (weak masculine), and Old High German ''ballâ, pallâ,'' Middle High German ''balle,'' Proto-Germanic ''*ballôn'' (weak feminine). No Old English representative of any of these is known. (The answering forms in Old English would have been ''beallu, -a, -e'' -- compare ''bealluc, ballock''.) If ''ball-'' was native in Germanic, it may have been a cognate with the Latin ''foll-is'' in sense of a "thing blown up or inflated." In the later Middle English spelling ''balle'' the word coincided graphically with the French ''balle'' "ball" and "bale", which has hence been erroneously assumed to be its source. French ''balle'' (but not ''boule'') is assumed to be of Germanic origin, itself, however. The first known use of the word ''ball'' in English in the sense of a globular body that is played with was in 1205 in '']'' in the phrase, "{{lang|la|Summe heo driuen balles wide ȝeond Þa feldes.}}" ("Some of them drove balls far across the fields.") The word came from the ] ''bal'' (inflected as ''ball-e, -es''), in turn from ] ''böllr'' (pronounced {{IPA-non|bɔlːr|}}; compare Old Swedish ''baller'', and Swedish ''boll'') from ] ''ballu-z'' (whence probably Middle High German ''bal, ball-es'', Middle Dutch ''bal''), a ] with ] ''ballo, pallo'', Middle High German balle from Proto-Germanic ''*ballon'' (weak masculine), and Old High German ''ballâ, pallâ'', Middle High German ''balle'', Proto-Germanic ''*ballôn'' (weak feminine). No Old English representative of any of these is known. (The answering forms in Old English would have been ''beallu, -a, -e''—compare ''bealluc, ballock''.) If ''ball-'' was native in Germanic, it may have been a cognate with the Latin ''foll-is'' in sense of a "thing blown up or inflated." In the later Middle English spelling ''balle'' the word coincided graphically with the French ''balle'' "ball" and "bale" which has hence been erroneously assumed to be its source. French ''balle'' (but not ''boule'') is assumed to be of Germanic origin, itself, however. In ] the word πάλλα (''palla'') for "ball" is attested<ref> {{webarchive|url=https://web.archive.org/web/20150924204511/http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0057:entry=pa%2Flla&highlight=ball |date=2015-09-24 }}, Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus</ref> besides the word σφαίρα (''sfaíra''), '']''.<ref> {{webarchive|url=https://web.archive.org/web/20170320052243/http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0057:entry%3Dsfai%3Dra%5E&highlight=ball |date=2017-03-20 }}, Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', on Perseus</ref>


== Images == ==History==
] balls ({{Langx|ru|мячи}}), 12th-13th century.]]
Some form of game with a ball is found portrayed on ] monuments.<ref>{{Cite web |last=Egypt State Information Service |title=Ancient Egyptian Sport |url=https://www.sis.gov.eg/section/10/733?lang=en-us |access-date=2024-05-27}}</ref> In ], ] was playing at ball with her maidens when ] first saw her in the land of the ]ns (Od. vi. 100). And Halios and Laodamas performed before ] and Odysseus with ball play, accompanied with dancing (Od. viii. 370).<ref name="eb1911"/> The most ancient balls in ] have been discovered in ], ] and are 3000 years old. They were made of hair-filled leather.<ref>{{cite web|url= https://www.smithsonianmag.com/smart-news/leather-balls-point-ancient-chinese-sport-180976102/|title=These Hair-Filled Leather Pouches Are the Oldest Balls Found in Eurasia|last=Gershon|first=Livia|date=October 21, 2020|website=www.smithsonianmag.com|publisher=]|access-date=November 2, 2020}}</ref>

===Ancient Greeks===
Among the ], games with balls (σφαῖραι) were regarded as a useful subsidiary to the more violent athletic exercises, as a means of keeping the body supple, and rendering it graceful, but were generally left to boys and girls. Of regular rules for the playing of ball games, little trace remains, if there were any such. The names in Greek for various forms, which have come down to us in such works as the Ὀνομαστικόν of ], imply little or nothing of such; thus, ἀπόρραξις (''aporraxis'') only means the putting of the ball on the ground with the open hand, οὐρανία (''ourania''), the flinging of the ball in the air to be caught by two or more players; φαινίνδα (''phaininda'') would seem to be a game of catch played by two or more, where feinting is used as a test of quickness and skill. Pollux (i. x. 104) mentions a game called ] (ἐπίσκυρος), which has often been looked on as the origin of football. It seems to have been played by two sides, arranged in lines; how far there was any form of "goal" seems uncertain.<ref name="eb1911">{{Cite EB1911|wstitle=Ball}}</ref> It was impossible to produce a ball that was perfectly spherical;<ref name="Garland2008">{{cite book|last=Garland|first=Robert|date=2008|title=Ancient Greece: Everyday Life in the Birthplace of Western Civilization|url=https://books.google.com/books?id=-R1PmAEACAAJ&q=Ancient+Greece:+Everyday+Life+in+the+Birthplace+of+Western+Civilization|publisher=Sterling|location=New York City, New York|isbn=978-1-4549-0908-8|page=96}}</ref> children usually made their own balls by inflating pig's bladders and heating them in the ashes of a fire to make them rounder,<ref name="Garland2008"/> although ] (fl. 420s BC – 340s BC) described "balls which have leather coverings in twelve pieces".<ref>{{cite book
| author = Plato
| author-link = Plato
| editor = Charles W. Eliot
| translator = Benjamin Jowett
| title = The Apology, Phædo and Crito of Plato – The Golden Sayings of Epictetus – The Meditations of Marcus Aurelius
| chapter-url = https://archive.org/details/harvardclassics002elio/page/107
| access-date = May 16, 2020
| edition = 1st
| series = The Harvard Classics
| volume = 2
| year = 1909
| publisher = P. F. Collier and Son
| location = New York
| page = 107
| chapter = Phædo (Dialogues of Plato)
}}</ref>

===Ancient Romans===
Among the ], ball games were looked upon as an adjunct to the bath, and were graduated to the age and health of the bathers, and usually a place (sphaeristerium) was set apart for them in the baths (thermae). There appear to have been three types or sizes of ball, the pila, or small ball, used in catching games, the paganica, a heavy ball stuffed with feathers, and the ], a leather ball filled with air, the largest of the three. This was struck from player to player, who wore a kind of ] on the arm. There was a game known as ], played by three players standing in the form of a triangle, and played with the follis, and also one known as ], which seems to imply a "scrimmage" among several players for the ball. These games are known to us through the Romans, though the names are Greek.<ref name="eb1911"/>

===Modern ball games===
]

The various modern games played with a ball or balls and subject to rules are treated under their various names, such as ], ], ], etc.<ref name="eb1911"/>

==Physics==
In ], many modern balls are pressurized. Some are pressurized at the factory (e.g. ], ]) and others are pressurized by users (e.g. ], ], ]). Almost all pressurized balls gradually leak air. If the ball is factory pressurized, there is usually a rule about whether the ball retains sufficient pressure to remain playable.<ref>{{Cite web |date=2015-08-10 |title=Preparing the Footballs for NFL Games {{!}} NFL Football Operations |url=https://operations.nfl.com/updates/the-game/preparing-the-footballs-for-nfl-games/ |access-date=2023-11-01 |website=operations.nfl.com |language=en-US}}</ref><ref>{{Cite web |last=LaCombe |first=Ronnie |title=How much air can fit in a basketball? |url=https://www.columbiatribune.com/story/lifestyle/family/2018/04/03/how-much-air-can-fit/985314007/ |access-date=2023-11-02 |website=Columbia Daily Tribune |language=en-US}}</ref> Depressurized balls lack bounce and are often termed "dead". In extreme cases, a dead ball becomes flaccid. If the ball is pressured on use, there are generally rules about how the ball is pressurized before the match, and when (or whether) the ball can be repressurized or replaced.

Due to the ], ball pressure is a function of temperature, generally tracking ambient conditions. Softer balls that are struck hard (especially squash balls) increase in temperature due to ].

In outdoor sports, wet balls play differently than dry balls. In indoor sports, balls may become damp due to hand sweat. Any form of humidity or dampness will affect a ball's surface friction, which will alter a player's ability to impart spin on the ball. The action required to apply spin to a ball is governed by the physics of ]. Spinning balls travelling through air (technically a ]) will experience the ], which can produce lateral deflections in addition to the normal up-down curvature induced by a combination of ] and ].
<gallery> <gallery>
File:Green Rubber Band Ball.jpg|]
Image:RadZepMov_soccer_hires_computed_tomography_shoe_and_ball_color.jpeg|Computed tomography of a soccer ball
Image:Baseball (ball) closeup.jpg|] File:Black Super Ball.jpg|]
File:A cherry utility ball in a field (cropped).jpg|]
Image:Basketball.jpeg|]
File:Sponge Ball.jpg|Sponge ball
Image:Cricket-ball-red-madeinaustralia.jpg|]
Image:Billiards balls.jpg|]
Image:Lacrosse ball.jpg|]
Image:Sherrin.png|]
Image:DSC 0313.JPG|]
Image:Wilson American football.jpg|]
Image:Pingpong.jpg|]
Image:Rugbyball2.jpg|]
</gallery> </gallery>

== Specifications ==
{| class="wikitable"
|+
!Sport
!Regulated by
!Shape
!Circumferency
!Diameter
!Weigth
!Pressure
!Material
!Image
|-
|]
|]
|]
|75-77 centimeters
| -
|580-620 grams
|
|leather, artificial/composite/synthetic leather
|]
|-
|]
|]
|Sphere
|{{Convert|26.704-27.002|in|cm}}
|{{Convert|8.5-8.595|in|cm}}
|{{Convert|16|lb|g}}
| -
|non-metallic
|]
|-
|]
|]
|Sphere
| -
|17-18 centimeters
|500-600 grams
|
|Textile (case)
|]
|-
|]
|]
|Sphere
|75.5-78.5 centimeters
|24-25 centimeters
|1200-1300 grams
|
|Natural rubber with internal bells
|
|-
|]
|]
|Sphere
| -
|{{Convert|1.68|in|cm}}
|{{Convert|1.62|oz|g}}
| -
|elastomeric material
|]
|-
|]
|]
|Sphere
|41-43 centimeters
| -
|170-180 grams
| -
|woven synthetic fiber
|]
|-
|]
|FITB
|Sphere
|58-60 centimeters
| -
|425-475 grams
|
|
|
|-
|] and ]
|]
|Sphere
|68-71 centimeters
| -
|400-450 grams
|{{Convert|7.5-8.5|psi}}
|
|]
|-
| colspan="9" |''']'''
|-
|]
| rowspan="2" |]
| rowspan="2" |Sphere
|{{Convert|9-9.25|in|cm}}
| -
|{{Convert|5-5.25|oz|g}}
| -
|
* cork or rubber (core)
* yarn
* white horsehide or cowhide (case)
|]
|-
|]
|{{Convert|11.875-12.125|in|cm}}
| -
|{{Convert|6.25-7|oz|g}}
| -
|
* long fiber kapok, mixture of cork and rubber or polyurethane mixture (core)
* twisted yarn and covered with latex or rubber cement
* horsehide or cowhide (case)
|]
|-
|]
|]
|Sphere
|{{Convert|8.81-9|in|cm}}
| -
|{{Convert|5.5-5.75|oz|g}}
| -
|
|]
|-
| colspan="9" |''']'''
|-
|]
|]
|Sphere
|26.2-27.8&nbsp;cm
| -
|263-287 grames
| -
|Vinyl, polyurethane fabric, leather, synthetic leather, suede
|]
|-
|] (bowl)
| rowspan="6" |]
| rowspan="6" |Sphere
| rowspan="2" | -
|8.9-11.1 centimeters
|900-1200 grams
| rowspan="2" | -
|Metal or synthetic
|]
|-
|Bocce volo (jack)
|3.5-3.7 centimeters
|23-27 grams
|wood
|
|-
|] (boule)
| rowspan="2" | -
|7.05-8 centimeters
|650-800 grams
| rowspan="2" | -
|Metal
| rowspan="2" |]
|-
|Petanque (jack)
|2.9-3.1 centimeters
|10-18 grams
|wood or synthetic
|-
|] (bowl)
| rowspan="2" | -
|10.55-10.75 centimeters
|895-925 grams
| rowspan="2" | -
| rowspan="2" |Synthetic
|
|-
|Raffa (pallino)
|3.9-4.1 centimeters
|83-97 grams
|
|-
| colspan="9" |''']'''
|-
|]
| rowspan="3" |]
| rowspan="3" |Sphere
| -
|6.1-6.15
centimeters
|205-220 grams
| -
|
|]
|-
|]
| -
|{{Convert|2.25-2.3|in|cm}}
|{{Convert|5.5-6|oz|g}}
| -
|cast phenolic resin plastic
|]
|-
|]
| -
|5.2-5.3 centimeters
| -
| -
|
|]
|-
| colspan="9" |''']'''
|-
|]
|]
| rowspan="2" |]<ref>{{Cite web |last=Weisstein |first=Eric W. |title=Lemon Surface |url=https://mathworld.wolfram.com/LemonSurface.html |access-date=2024-10-31 |website=mathworld.wolfram.com |language=en}}</ref>
|{{Convert|28-28.5|in|cm}} (longitudinal) ×
{{Convert|21-21.25|in|cm}} (transversal)
|{{Convert|11-11.25|in|cm}} (longitudinal)
| rowspan="2" |{{Convert|14-15|oz|g}}
| rowspan="2" |{{Convert|12.5-13.5|psi}}
|urethane (bladder), case (leather)
|]
|-
|Canadian football
|]
|{{Convert|27.75-28.5|in|cm}} (longitudinal)
{{Convert|20.75-21.375|in|cm}} (transversal)
|{{Convert|10.875-11.4375|in|cm}} (longitudinal)
{{Convert|6.25-6.75|in|cm}} (transversal)
|
|]
|-
|]
| rowspan="3" |]
| rowspan="3" |Sphere
|{{Convert|27-28|in|cm}}
| -
|{{Convert|14-16|oz|g}}
|{{Convert|8.5-15.6|psi}}
| -
|]
|-
|]
|68-70 centimeters
| -
| rowspan="2" |400-440 grams
|{{Convert|0.4-0.6|atm}}
| -
|]
|-
|]
|62-64 centimeters
| -
|{{Convert|0.6-0.9|atm}}
| -
|
|-
|]
|]
|]
|72 – 73&nbsp;cm (elliptic) ×
54.5 -55.5&nbsp;cm (circular)
| -
| -
|69 kilopascals
| -
|]
|-
|]
|]
|Sphere
|68-70 centimeters
| -
|480-500 grams
| {{Convert|9-10|psi}}
| -
|]
|-
|] league
|]
| rowspan="2" |Prolate spheroid
|
|
|
|
|leather
|]
|-
|] union
|]
|74 - 77 centimeters (elliptic) ×
58 - 62 centimeters (circular)
|28-30 centimeters (longitudinal)
|410 - 460 grams
|{{Convert|9.5-10|psi}}
|leather or synthetic material
|]
|-
| colspan="9" |'''Handball'''
|-
|] (with resine)
| rowspan="3" |]
| rowspan="3" |Sphere
|58-60 centimeters
| -
|425-475 grams
|
| rowspan="2" |leather or synthetic
| rowspan="2" |]
|-
|] (without resine)
|55.5-57.5 centimeters
| -
|400-425 grams
|
|-
|]
|54-56 centimeters
| -
|350-370 grams
|
|rubber
|
|-
| colspan="9" |''']'''
|-
|] and ]
|]
|Sphere
| -
|6.1-6.5 centimeters
|60-65 grams
| -
| -
|]
|-
|] and ] hockey
| rowspan="2" |]
| rowspan="2" |Sphere
|22.4-23.5 centimeters
| -
|156-163 grams
| -
| -
|]
|-
|Beach hockey
|45 centimeters
| -
|140-250 grams
| -
| -
|
|-
|]
|]
|Sphere
| -
|7.2 centimeters
|145-155 grams
| -
|pressed rubber/plastic
|]
|-
| colspan="9" |''']'''
|-
|] and ]
| rowspan="3" |]
| rowspan="3" |Sphere
|{{Convert|7.75-8|in|cm}}
| -
|{{Convert|5-5.25|oz|g}}
| -
|rubber
|]
|-
|]
|19.7-20.3 centimeters
| -
| -
| -
| rowspan="2" |elastomeric
|
|-
|]
|20-20.3 centimeters
| -
|142-149 grams
| -
|
|-
| colspan="9" |'''Polo'''
|-
|]
| rowspan="2" |]
| rowspan="2" |Sphere
| -
|{{Convert|3-3.5|in|cm}}
|{{Convert|4.25-4.75|oz|g}}
| -
|
|
|-
|Snow polo
|{{Convert|15|in|cm}}
| -
|{{Convert|6|oz|g}}
|
|
|
|-
| colspan="9" |'''Racquet sports'''
|-
|]
|]
|Sphere
| -
|3.95-4.05 centimeters
|23-25 grams
|
| -
|]
|-
|]
|]
|Sphere
| -
|4 centimeters
|2.7 grams
| -
|plastic
|]
|-
|]
|]
|Sphere
| -
|{{Convert|6.54-6.86|cm|in}}
|{{Convert|56-59.4|g|oz}}
|{{Convert|1|psi}}
|
|]
|-
| colspan="9" |'''Volleyball'''
|-
|]
| rowspan="2" |]
| rowspan="2" |Sphere
|65-67 centimeters
| -
| rowspan="2" |260 - 280 grams
|{{Convert|4.26-4.61|psi}}
| rowspan="2" |rubber (bladder), leather or synthetic leather (case)
|]
|-
|] and ] volleyball
|66-68 centimeters
| -
|17.1-22.1 kilopascals
|]
|}


== See also == == See also ==
* ]
* ] "Bucky balls"
* ], used in a tumbling dryer
* ]
* ], can also spin, bounce, and roll
* ]
* ]
* ]
* ]
* ]
* ] * ]


== References ==
]
{{reflist}}


== External links ==
]
* {{Wiktionary-inline|ball}}
]
{{Authority control}}
]

]
] ]
] ]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]
]

Latest revision as of 17:40, 8 January 2025

Round object For other uses, see Ball (disambiguation).

Group of balls

A ball is a round object (usually spherical, but can sometimes be ovoid) with several uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch or juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black-powder weapons use stone and metal balls as projectiles.

Although many types of balls are today made from rubber, this form was unknown outside the Americas until after the voyages of Columbus. The Spanish were the first Europeans to see the bouncing rubber balls (although solid and not inflated) which were employed most notably in the Mesoamerican ballgame. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials.

As balls are one of the most familiar spherical objects to humans, the word "ball" may refer to or describe spherical or near-spherical objects.

"Ball" is used metaphorically sometimes to denote something spherical or spheroid, e.g., armadillos and human beings curl up into a ball, making a fist into a ball.

Etymology

The first known use of the word ball in English in the sense of a globular body that is played with was in 1205 in Layamon's Brut, or Chronicle of Britain in the phrase, "Summe heo driuen balles wide ȝeond Þa feldes." ("Some of them drove balls far across the fields.") The word came from the Middle English bal (inflected as ball-e, -es), in turn from Old Norse böllr (pronounced [bɔlːr]; compare Old Swedish baller, and Swedish boll) from Proto-Germanic ballu-z (whence probably Middle High German bal, ball-es, Middle Dutch bal), a cognate with Old High German ballo, pallo, Middle High German balle from Proto-Germanic *ballon (weak masculine), and Old High German ballâ, pallâ, Middle High German balle, Proto-Germanic *ballôn (weak feminine). No Old English representative of any of these is known. (The answering forms in Old English would have been beallu, -a, -e—compare bealluc, ballock.) If ball- was native in Germanic, it may have been a cognate with the Latin foll-is in sense of a "thing blown up or inflated." In the later Middle English spelling balle the word coincided graphically with the French balle "ball" and "bale" which has hence been erroneously assumed to be its source. French balle (but not boule) is assumed to be of Germanic origin, itself, however. In Ancient Greek the word πάλλα (palla) for "ball" is attested besides the word σφαίρα (sfaíra), sphere.

History

Russian leather balls (Russian: мячи), 12th-13th century.

Some form of game with a ball is found portrayed on Egyptian monuments. In Homer, Nausicaa was playing at ball with her maidens when Odysseus first saw her in the land of the Phaeacians (Od. vi. 100). And Halios and Laodamas performed before Alcinous and Odysseus with ball play, accompanied with dancing (Od. viii. 370). The most ancient balls in Eurasia have been discovered in Karasahr, China and are 3000 years old. They were made of hair-filled leather.

Ancient Greeks

Among the ancient Greeks, games with balls (σφαῖραι) were regarded as a useful subsidiary to the more violent athletic exercises, as a means of keeping the body supple, and rendering it graceful, but were generally left to boys and girls. Of regular rules for the playing of ball games, little trace remains, if there were any such. The names in Greek for various forms, which have come down to us in such works as the Ὀνομαστικόν of Julius Pollux, imply little or nothing of such; thus, ἀπόρραξις (aporraxis) only means the putting of the ball on the ground with the open hand, οὐρανία (ourania), the flinging of the ball in the air to be caught by two or more players; φαινίνδα (phaininda) would seem to be a game of catch played by two or more, where feinting is used as a test of quickness and skill. Pollux (i. x. 104) mentions a game called episkyros (ἐπίσκυρος), which has often been looked on as the origin of football. It seems to have been played by two sides, arranged in lines; how far there was any form of "goal" seems uncertain. It was impossible to produce a ball that was perfectly spherical; children usually made their own balls by inflating pig's bladders and heating them in the ashes of a fire to make them rounder, although Plato (fl. 420s BC – 340s BC) described "balls which have leather coverings in twelve pieces".

Ancient Romans

Among the Romans, ball games were looked upon as an adjunct to the bath, and were graduated to the age and health of the bathers, and usually a place (sphaeristerium) was set apart for them in the baths (thermae). There appear to have been three types or sizes of ball, the pila, or small ball, used in catching games, the paganica, a heavy ball stuffed with feathers, and the follis, a leather ball filled with air, the largest of the three. This was struck from player to player, who wore a kind of gauntlet on the arm. There was a game known as trigon, played by three players standing in the form of a triangle, and played with the follis, and also one known as harpastum, which seems to imply a "scrimmage" among several players for the ball. These games are known to us through the Romans, though the names are Greek.

Modern ball games

An early manual for teaching basketball
An early manual for teaching basketball

The various modern games played with a ball or balls and subject to rules are treated under their various names, such as polo, cricket, football, etc.

Physics

In sports, many modern balls are pressurized. Some are pressurized at the factory (e.g. tennis, squash (sport)) and others are pressurized by users (e.g. volleyball, basketball, football). Almost all pressurized balls gradually leak air. If the ball is factory pressurized, there is usually a rule about whether the ball retains sufficient pressure to remain playable. Depressurized balls lack bounce and are often termed "dead". In extreme cases, a dead ball becomes flaccid. If the ball is pressured on use, there are generally rules about how the ball is pressurized before the match, and when (or whether) the ball can be repressurized or replaced.

Due to the ideal gas law, ball pressure is a function of temperature, generally tracking ambient conditions. Softer balls that are struck hard (especially squash balls) increase in temperature due to inelastic collision.

In outdoor sports, wet balls play differently than dry balls. In indoor sports, balls may become damp due to hand sweat. Any form of humidity or dampness will affect a ball's surface friction, which will alter a player's ability to impart spin on the ball. The action required to apply spin to a ball is governed by the physics of angular momentum. Spinning balls travelling through air (technically a fluid) will experience the Magnus effect, which can produce lateral deflections in addition to the normal up-down curvature induced by a combination of wind resistance and gravity.

Specifications

Sport Regulated by Shape Circumferency Diameter Weigth Pressure Material Image
Basketball FIBA Sphere 75-77 centimeters - 580-620 grams leather, artificial/composite/synthetic leather
Bowling IBF Sphere 26.704–27.002 inches (67.83–68.59 cm) 8.5–8.595 inches (21.59–21.83 cm) 16 pounds (7,300 g) - non-metallic
Cycle ball UCI Sphere - 17-18 centimeters 500-600 grams Textile (case)
Goalball IBSA Sphere 75.5-78.5 centimeters 24-25 centimeters 1200-1300 grams Natural rubber with internal bells
Golf IGF Sphere - 1.68 inches (4.3 cm) 1.62 ounces (46 g) - elastomeric material
Sepaktakraw ISTAF Sphere 41-43 centimeters - 170-180 grams - woven synthetic fiber
Tchoukball FITB Sphere 58-60 centimeters - 425-475 grams
Waterpolo and Canoe Polo World Aquatics Sphere 68-71 centimeters - 400-450 grams 7.5–8.5 pounds per square inch (52–59 kPa)
Bat and ball sports
Baseball WBSC Sphere 9–9.25 inches (22.9–23.5 cm) - 5–5.25 ounces (142–149 g) -
  • cork or rubber (core)
  • yarn
  • white horsehide or cowhide (case)
Softball 11.875–12.125 inches (30.16–30.80 cm) - 6.25–7 ounces (177–198 g) -
  • long fiber kapok, mixture of cork and rubber or polyurethane mixture (core)
  • twisted yarn and covered with latex or rubber cement
  • horsehide or cowhide (case)
Cricket ICC Sphere 8.81–9 inches (22.4–22.9 cm) - 5.5–5.75 ounces (156–163 g) -
Boules
Boccia BISFed Sphere 26.2-27.8 cm - 263-287 grames - Vinyl, polyurethane fabric, leather, synthetic leather, suede
Bocce volo (bowl) WPBF Sphere - 8.9-11.1 centimeters 900-1200 grams - Metal or synthetic
Bocce volo (jack) 3.5-3.7 centimeters 23-27 grams wood
Petanque (boule) - 7.05-8 centimeters 650-800 grams - Metal
Petanque (jack) 2.9-3.1 centimeters 10-18 grams wood or synthetic
Raffa (bowl) - 10.55-10.75 centimeters 895-925 grams - Synthetic
Raffa (pallino) 3.9-4.1 centimeters 83-97 grams
Cue sports
Carom WCBS Sphere - 6.1-6.15

centimeters

205-220 grams -
Pool - 2.25–2.3 inches (5.7–5.8 cm) 5.5–6 ounces (160–170 g) - cast phenolic resin plastic
Snooker - 5.2-5.3 centimeters - -
Football codes
American football IFAF Lemon 28–28.5 inches (71–72 cm) (longitudinal) ×

21–21.25 inches (53.3–54.0 cm) (transversal)

11–11.25 inches (27.9–28.6 cm) (longitudinal) 14–15 ounces (400–430 g) 12.5–13.5 pounds per square inch (86–93 kPa) urethane (bladder), case (leather)
Canadian football Football Canada 27.75–28.5 inches (70.5–72.4 cm) (longitudinal)

20.75–21.375 inches (52.71–54.29 cm) (transversal)

10.875–11.4375 inches (27.623–29.051 cm) (longitudinal)

6.25–6.75 inches (15.9–17.1 cm) (transversal)

Asocciation football FIFA Sphere 27–28 inches (69–71 cm) - 14–16 ounces (400–450 g) 8.5–15.6 pounds per square inch (59–108 kPa) -
Beach soccer 68-70 centimeters - 400-440 grams 0.4–0.6 standard atmospheres (41–61 kPa) -
Futsal 62-64 centimeters - 0.6–0.9 standard atmospheres (61–91 kPa) -
Australian rules football AFL Commission Prolate spheroid 72 – 73 cm (elliptic) ×

54.5 -55.5 cm (circular)

- - 69 kilopascals -
Gaelic football GAA Sphere 68-70 centimeters - 480-500 grams 9–10 pounds per square inch (62–69 kPa) -
Rugby league IRL Prolate spheroid leather
Rugby union World Rugby 74 - 77 centimeters (elliptic) ×

58 - 62 centimeters (circular)

28-30 centimeters (longitudinal) 410 - 460 grams 9.5–10 pounds per square inch (66–69 kPa) leather or synthetic material
Handball
Handball (with resine) IHF Sphere 58-60 centimeters - 425-475 grams leather or synthetic
Handball (without resine) 55.5-57.5 centimeters - 400-425 grams
Beach handball 54-56 centimeters - 350-370 grams rubber
Hockey
Bandy and Rink bandy FIB Sphere - 6.1-6.5 centimeters 60-65 grams - -
Field and indoor hockey FIH Sphere 22.4-23.5 centimeters - 156-163 grams - -
Beach hockey 45 centimeters - 140-250 grams - -
Rolley hockey World Skate Sphere - 7.2 centimeters 145-155 grams - pressed rubber/plastic
Lacrosse
Field and Box lacrosse World Lacrosse Sphere 7.75–8 inches (19.7–20.3 cm) - 5–5.25 ounces (142–149 g) - rubber
Sixes 19.7-20.3 centimeters - - - elastomeric
Women lacrosse 20-20.3 centimeters - 142-149 grams -
Polo
Polo FIP Sphere - 3–3.5 inches (7.6–8.9 cm) 4.25–4.75 ounces (120–135 g) -
Snow polo 15 inches (38 cm) - 6 ounces (170 g)
Racquet sports
Squash WSF Sphere - 3.95-4.05 centimeters 23-25 grams -
Table tennis ITTF Sphere - 4 centimeters 2.7 grams - plastic
Tennis ITF Sphere - 6.54–6.86 centimetres (2.57–2.70 in) 56–59.4 grams (1.98–2.10 oz) 1 pound per square inch (6.9 kPa)
Volleyball
Volleyball FIVB Sphere 65-67 centimeters - 260 - 280 grams 4.26–4.61 pounds per square inch (29.4–31.8 kPa) rubber (bladder), leather or synthetic leather (case)
Beach and Snow volleyball 66-68 centimeters - 17.1-22.1 kilopascals

See also

References

  1. "Code of Federal Regulations: 1985–1999". U.S. General Services Administration, National Archives and Records Service, Office of the Federal Register. November 5, 1999. Archived from the original on November 7, 2017. Retrieved November 5, 2017 – via Google Books.
  2. πάλλα Archived 2015-09-24 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  3. σφαίρα Archived 2017-03-20 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
  4. Egypt State Information Service. "Ancient Egyptian Sport". Retrieved May 27, 2024.
  5. ^ Chisholm, Hugh, ed. (1911). "Ball" . Encyclopædia Britannica (11th ed.). Cambridge University Press.
  6. Gershon, Livia (October 21, 2020). "These Hair-Filled Leather Pouches Are the Oldest Balls Found in Eurasia". www.smithsonianmag.com. Smithsonian Institution. Retrieved November 2, 2020.
  7. ^ Garland, Robert (2008). Ancient Greece: Everyday Life in the Birthplace of Western Civilization. New York City, New York: Sterling. p. 96. ISBN 978-1-4549-0908-8.
  8. Plato (1909). "Phædo (Dialogues of Plato)". In Charles W. Eliot (ed.). The Apology, Phædo and Crito of Plato – The Golden Sayings of Epictetus – The Meditations of Marcus Aurelius. The Harvard Classics. Vol. 2. Translated by Benjamin Jowett (1st ed.). New York: P. F. Collier and Son. p. 107. Retrieved May 16, 2020.
  9. "Preparing the Footballs for NFL Games | NFL Football Operations". operations.nfl.com. August 10, 2015. Retrieved November 1, 2023.
  10. LaCombe, Ronnie. "How much air can fit in a basketball?". Columbia Daily Tribune. Retrieved November 2, 2023.
  11. Weisstein, Eric W. "Lemon Surface". mathworld.wolfram.com. Retrieved October 31, 2024.

External links

  • The dictionary definition of ball at Wiktionary
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