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tennis ball
A tennis ball is a ball designed for the sport of tennis. Tennis balls are yellow at major sporting events,〔(【引用サイトリンク】url=http://www.itftennis.com/technical/balls/other/history.aspx )〕 but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aerodynamic properties, and each has a white curvilinear oval covering it.
==Specifications==
Modern tennis balls must conform to certain criteria for size, weight, deformation, and bounce criteria to be approved for regulation play. The International Tennis Federation (ITF) defines the official diameter as . Balls must have masses in the range . Yellow and white are the only colors approved by the ITF, and most balls produced are a fluorescent yellow known as "optic yellow", first introduced in 1972 following research demonstrating they were more visible on television.
Tennis balls are filled with air and are surfaced by a uniform felt-covered rubber compound. The felt delays flow separation in the boundary layer which reduces aerodynamic drag and gives the ball better flight properties.〔Dr. Rabi Mehta of NASA-Ames, entitled ''Aerodynamics of sportsballs, Annual Review of Fluid Mechanics'', 17:151–189, 1985.〕 Often the balls will have a number on them in addition to the brand name. This helps distinguish one set of balls from another of the same brand on an adjacent court.〔(【引用サイトリンク】title=Colors & Numbers on Tennis Balls )〕
Tennis balls begin to lose their bounce as soon as the tennis ball can is opened and can be tested to determine their bounce. Modern regulation tennis balls are kept under pressure (approximately two atmospheres) until initially used; balls intended for use at high altitudes have a lower initial pressure, and inexpensive practice balls are made without internal pressurization. A ball is tested for bounce by dropping it from a height of onto concrete; a bounce between is acceptable—if taking place at sea-level and with relative humidity of 60%; high-altitude balls have different characteristics when tested at sea-level.〔(【引用サイトリンク】title=ITF Technical - Approval Tests )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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