Tennis ball
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 6.54–6.86 cm (2.57–2.70 inches). Balls must have masses in the range 56.0–59.4 g (1.98–2.10 ounces). 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.
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Tennis ball
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 6.54–6.86 cm (2.57–2.70 inches). Balls must have masses in the range 56.0–59.4 g (1.98–2.10 ounces). 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.
has abstract
Bola de tênis (ou ténis) é uma ...... tênis pesa de 56 a 58 gramas.
@pt
De tennisbal wordt gebruikt bi ...... nde baansoorten en weerstypen.
@nl
Der Tennisball ist das Spielge ...... der Tennisschläger getroffen.
@de
Modern tennis balls must confo ...... tics when tested at sea-level.
@en
Una pelota de tenis es una pel ...... tenis pesa de 56 a 58 gramos.
@es
Теннисный мяч — предназначен д ...... ию, которая охватывает снаряд.
@ru
テニスボールはテニス用に作られたボール。表面を覆う毛羽のある ...... 下を測る。)繋ぎ目があってもよいが縫い目があってはならない。
@ja
比賽用網球分為兩大種類：硬式網球和軟式網球，這兩種都是必須遵照國際網球協會、國際奧林匹克委員會指示使用。
@zh
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Bola de tênis (ou ténis) é uma ...... tênis pesa de 56 a 58 gramas.
@pt
De tennisbal wordt gebruikt bi ...... nde baansoorten en weerstypen.
@nl
Der Tennisball ist das Spielge ...... der Tennisschläger getroffen.
@de
Modern tennis balls must confo ...... re more visible on television.
@en
Una pelota de tenis es una pel ...... tenis pesa de 56 a 58 gramos.
@es
Теннисный мяч — предназначен д ...... ию, которая охватывает снаряд.
@ru
テニスボールはテニス用に作られたボール。表面を覆う毛羽のある ...... 下を測る。)繋ぎ目があってもよいが縫い目があってはならない。
@ja
比賽用網球分為兩大種類：硬式網球和軟式網球，這兩種都是必須遵照國際網球協會、國際奧林匹克委員會指示使用。
@zh
label
Bola de tênis
@pt
Pelota de tenis
@es
Tennis ball
@en
Tennisbal
@nl
Tennisball
@de
Мяч (теннис)
@ru
テニスボール
@ja
網球 (球)
@zh
