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750–770 mm 29.5–30.3 in [4] 580–620 g 20–22 oz [4] Men and boys ages 15 and up. This is the official size for men's high school, college, and professional. 6: Women: 715–730 mm 28.1–28.7 in [4] 510–550 g 18–19 oz [4] Boys ages 12–14. Women and girls ages 12 and up. This is the official size for women's high school, college ...
The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10 −6 metres ( 1 / 1 000 000 m = 0. 000 001 m). To help compare different orders of magnitude , this section lists some items with lengths between 10 −6 and 10 −5 m (between 1 and 10 micrometers , or μm).
Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, Sizes 1, 3, and 4, are also produced for younger players or as training tools. [20]
A regulation baseball is 9 to 9.25 inches (229 to 235 mm) in circumference i.e. 2.86 to 2.94 inches (73 to 75 mm) in diameter, with a weight of 5 to 5.25 ounces (0.142 to 0.149 kg). [1] The leather cover is commonly formed from two saddle-shaped pieces stitched together, typically with red-dyed thread. There are 108 stitches on a regulation ...
A racquetball; a dynamic (bouncy) rubber ball of 2.25 in. (57 mm) diameter; A racquetball racquet; no longer than 22 inches; Racquetball eyeguards (mandatory during competitions; some recreational players play without eyeguards but this is not recommended, as being hit in the eye by the ball can cause serious injury and/or permanent vision damage).
The football used in rugby league is known as "international size" or "size 5" and is approximately 27 cm (11 in) long and 60 cm (24 in) in circumference at its widest point. Smaller-sized balls are used for junior versions of the game, such as "Mini" and "Mod". A full size ball weighs between 383 and 440 g (13.5 and 15.5 oz).
Modern tennis balls must conform to certain 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). A tennis ball generally has 12 ...
8.81 to 9 in (224 to 229 mm) Women, and girls 13 and over: 4.94 to 5.31 oz (140 to 151 g) 8.25 to 8.88 in (210 to 226 mm) Children under 13: 4.69 to 5.06 oz (133 to 143 g) 8.06 to 8.69 in (205 to 221 mm) Younger children A plastic ball such as a "Kwik cricket ball" is often used