8-ball Pool: Most commonly played pool game in the United States. The goal is to claim a suit and pocket all of the followed by the black 8 ball. Most pool games are based on this variation. Popular games include 8 Ball Billiards and Pool Club.

Pool is a classification of cue sports and can be also referred to as pocket billiards. Pool is played on a table with six pockets into which balls can be deposited. There are multiple pool games each with their own specific rule set.


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A billiard ball is a small, hard ball used in cue sports, such as carom billiards, pool, and snooker. The number, type, diameter, color, and pattern of the balls differ depending upon the specific game being played. Various particular ball properties such as hardness, friction coefficient, and resilience are important to accuracy.

However, Hyatt's composite had problems. One of the most relevant is cellulose nitrate flammability, not because of making the billiard balls explode, as is often claimed, but because of the dangers of handling it in its pure form during manufacturing. Another problem was related to camphor mass exploitation, leading to the devastation of Taiwan's forests and displacement of indigenous communities.[4][7] Subsequently, the industry experimented with various other synthetic materials for billiard balls such as Bakelite, acrylic, and other plastic compounds.

The exacting requirements of the billiard ball are met today with balls cast from plastic materials that are strongly resistant to cracking and chipping. Currently Saluc, under the brand name Aramith and other private labels, manufactures phenolic resin balls.[8][9] Other plastics and resins such as polyester (similar to those used for bowling balls) and clear acrylic are also used.

Rotation games do not distinguish between solids and stripes, but rather use the numbering on the balls to determine which object ball must be pocketed. In other games such as straight pool neither type of marking is of any consequence.

Some balls used in televised pool games are colored differently in order to make them more distinguishable on television monitors. Most commonly, the dark purple used on the 4 and 12 balls is replaced by pink to make it easier to distinguish the 4 from the black 8 ball, and similarly the 7 and 15 balls use a lighter brown color instead of a deep maroon. Other, less common color substitutions are also found, dependent on manufacturer. These sets often have a cue ball with multiple spots on its surface so that spin placed on it is evident to viewers.

Coin-operated pool tables, such as those found at bowling alleys, arcades, or bars/pubs, may use a slightly different-sized cue ball, so that the cue ball can be separated from object balls by the table's ball return mechanism and delivered into its own ball return. Such different sized cue balls are considered less than ideal because they change the dynamics of the equipment. Other tables use a system where a magnet pulls a cue ball with a thin layer of metal embedded inside away from the object ball collection chamber and into the cue ball return, allowing the cue ball to more closely match the object balls in size and weight. More recently, optical systems that recognize the cue ball, which is more translucent than the other balls due to its solid white color, and separate it mechanically have been developed.

In British-style eight-ball pool and its blackball variant, fifteen object balls are used, but fall into two unnumbered groups, the reds (or less commonly blues) and yellows, with a white cue ball, and black 8 ball.

Ball sets for snooker consist of twenty-two balls in total, arranged as a rack of 15 unmarked red balls, six colour balls placed at various predetermined spots on the table, and a white cue ball. The colour balls are sometimes numbered with their point values in the style of pool balls for the home market.

The set of eight colours used for snooker balls (including white) are thought to be derived from croquet, which uses the same set of colors. Snooker was invented in 1884 by British Army officers stationed in India. Croquet reached its peak popularity at the same time, particularly among people in the same social context. There are many other similarities between croquet and snooker, which when taken together, suggest that the derivation of the latter owes much to the existence of the former.[15]

Various other games have their own variants of billiard balls. English billiards uses the same number of balls as carom billiards, but the same size as snooker balls, as the game is played on the same size table as snooker. Each player uses a separate cue ball, with modern English billiards sets using one white ball with red spots and the other being yellow with red spots.

The 8 ball is frequently used in Western, especially American, culture as an element of T-shirt designs, album covers and names, tattoos, household goods like paperweights and cigarette lighters, belt buckles, etc. A classic toy is the Magic 8-Ball "oracle".

Because the collisions between billiard balls are nearly elastic, and the balls roll on a surface that produces low rolling friction, their behavior is often used to illustrate Newton's laws of motion. Idealized, frictionless billiard balls are a staple of mathematical theorems and physics models, and figure in dynamical billiards, scattering theory, Lissajous knots, billiard ball computing, and reversible cellular automata, Polchinski's paradox, contact dynamics, collision detection, the illumination problem, atomic ultracooling, quantum mirages, and elsewhere in these fields.

"Billiard balls" or "pool balls" is the name given to balls used in stage magic tricks, especially the classic "multiplying billiard balls". Though obviously derived from real billiard balls, today they are usually smaller, for easier manipulation and hiding, but not so small and light that they are difficult to juggle, as the magic and juggling disciplines have often overlapped since their successful combination by pioneers like Paul Vandy.

The phrase "as smooth as a billiard ball" is sometimes applied to describe a bald person, and the term "cue ball" is also slang for someone who sports a shaved head. An urban legend received cultural attention to many saying, "If the Earth were the size of a billiard ball, it would be smoother". It was used by Discover magazine in 2008,[23] stating no diameter variations measuring +/- 0.005 inches (0.13 mm) should be detectable, but mistook the diameter tolerance for smoothness. If the Earth were reduced to the size of a billiard ball, its mountains and trenches would equal the texture of 320 grit sandpaper and the variation in diameter would be 0.0049 inches (0.12 mm), which is near the maximum diameter tolerance.[24] .mw-parser-output div.crossreference{padding-left:0}(See also: Earth  Size and shape.)

Nine-ball (sometimes written 9-ball) is a discipline of the cue sport pool. The game's origins are traceable to the 1920s in the United States. It is played on a rectangular billiard table with pockets at each of the four corners and in the middle of each long side. Using a cue stick, players must strike the white cue ball to pocket nine colored billiard balls, hitting them in ascending numerical order. An individual game (or rack) is won by the player pocketing the 9-ball. Matches are usually played as a race to a set number of racks, with the player who reaches the set number winning the match.

The game is currently governed by the World Pool-Billiard Association (WPA), with multiple regional tours. The most prestigious nine-ball tournaments are the WPA World Nine-ball Championship and the U.S. Open Nine-ball Championships. Notable 9-Ball players in the game include Luther Lassiter, Buddy Hall, Earl Strickland and Shane Van Boening. The game is often associated with hustling and gambling, with tournaments often having a "buy-in" amount to become a participant. The sport has featured in popular culture, notably in the 1961 film The Hustler and its 1986 sequel The Color of Money.

Nine-ball has been played with varied rules, with games such as ten-ball, seven-ball and three-ball being derived from the game. While usually a singles sport, the game can be played in doubles, with players completing alternate shots. Examples of tournaments featuring doubles include the World Cup of Pool, World Team Championship and the Mosconi Cup.

The game of nine-ball is played on a billiard table with six pockets. The cue ball, which is usually a solid shade of white (but may be spotted in some tournaments), is struck to hit the nine object balls, which are numbered 1 through 9, each a distinct color, with the 9-ball typically having a yellow stripe on a white base. The aim of the game is to hit the lowest numbered ball on the table (often referred to as the ball on) and pocket balls in succession to eventually pocket the nine-ball.[5] As long as the lowest numbered ball on the table is contacted first by the cueball, and any one or more of the object balls are pocketed in any of the pockets with no foul being committed, a player's inning continues. When the table passes to another player, they must play from where the balls were last positioned, except if the prior inning ended in a foul. In that case, the incoming player takes ball in hand, anywhere on the table. The winner is the player who legally pockets the nine-ball, the game's money ball, regardless of how many balls have been pocketed beforehand. This can happen earlier than the nine-ball being the sole remaining object ball on the table if it is pocketed via a combination or other indirect method.[5]

Each rack begins with the object balls placed in a rack and one player playing a break.[6] The object balls are placed in a diamond-shaped configuration, with the 1-ball positioned at the front on the foot spot, and the 9-ball placed in the center. The rack used to position the balls may be either triangle-shaped, as is used for eight-ball and other pool games, or a specific diamond-shaped rack that holds only nine balls may be used. Racks are usually made of wood or plastic.[7] A template that lies on the table during the break has also come into use.[7] ff782bc1db

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