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Basketballs and baseballs are designed for their specific sports, with unique functions and features. Basketballs are spherical and hollow, with an elastic quality and a pebbled texture for grip and control. They are relatively large, ranging from a few inches in diameter to nearly 2 feet (60 cm) for training balls. A standard basketball weighs around 600 grams, making it heavier than a baseball, which weighs about 145 grams.
| Characteristics | Values |
|---|---|
| Weight | Basketball: 600 grams; Baseball: 145 grams |
| Volume | Basketball: 600 cm³; Baseball: 73 cm³ |
| Density | Basketball: 1.00 g/cm³; Baseball: 1.99 g/cm³ |
| Size | Basketball: 27-76 cm (circumference); Baseball: ~7.3 cm (diameter) |
| Shape | Both are spherical |
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What You'll Learn
Basketball weight and size
Basketballs are designed to be light, so they can be carried, shot, and dribbled. They are spherical and nearly always have an inflatable inner rubber bladder, wrapped in layers of fibre and covered in leather, rubber, or a synthetic composite. Basketballs usually range in size from a few inches in diameter for small promotional items to nearly 2 feet (60 cm) in diameter for training exercises.
The size of a basketball varies by age, gender, and level of play. For example, boys and girls between the ages of 4 and 8 use a basketball between 22 and 24.5 inches in circumference, depending on hand size. Middle school boys (or ages 12-14) use a 28.5-inch ball, as do all women and girls ages 12 and up. For anyone, male or female, between the ages of 9 and 11, a ball size of 27.5 inches in circumference is recommended and is the most common size used in youth basketball leagues. A youth basketball could be 27 inches (69 cm) in circumference.
The official size of the basketball used in the NBA is 29.5 inches (75 cm) in circumference. This is the same size used throughout men's college and high school basketball leagues. The WNBA uses a slightly smaller ball, measuring 28.5 inches (72 cm) in circumference. The standard weight of an NBA basketball is 22 ounces, while the WNBA uses a ball with a maximum weight of 20 ounces.
For international play, specifically FIBA, the basketball used is called a Molten GL7 for men and Molten GL6 for women. These basketballs typically feature two different colours and are slightly bigger, with a 30.7-inch circumference for the men’s ball and a 29-inch circumference for the women’s.
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Baseball weight and size
Baseballs have undergone a series of changes since the mid-1800s, when the game first began to gain popularity. Initially, there was a great variety in the size, shape, weight, and manufacturing processes of baseballs. However, in the mid-1850s, teams in and around New York met to standardize the baseball, regulating its weight at 51⁄2–6 oz and its circumference to 8–11 inches. This standardization, however, did not eliminate the variations in baseballs, as they were still handmade.
The baseball's core composition has also evolved over time. Initially, baseballs had a rubber core, which was later replaced by a cork-core in 1910, as cork outlasted rubber. During World War II, due to restrictions on the use of rubber for non-war-related goods, baseballs were made with rubber-like shells of balata, obtained from tropical trees. In 1944, the introduction of synthetic rubber brought baseballs back to their original composition.
Today, a regulation baseball has standardized dimensions and weight. Its circumference is 9 to 9.25 inches (229 to 235 mm), with a diameter of 2.86 to 2.94 inches (73 to 75 mm). The weight of a baseball is between 5 to 5.25 ounces (142 to 149 grams). The ball is composed of a cork-and-rubber core, wrapped tightly with yarn and coated with a special rubber cement. This is then covered with two pieces of white leather, sewn together with 108 stitches, typically using red-dyed thread.
The stitching on a baseball plays a significant role in its trajectory when thrown. The interaction between the stitching and the air affects the drag, allowing pitchers to manipulate the behavior of the pitched ball using different techniques.
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Density of basketball and baseball
The density of an object is calculated by dividing its mass by its volume. The standard density range for official baseballs is between 0.70 g/cm³ and 0.80 g/cm³. For example, a baseball with a mass of 145 grams and a diameter of 7.5 cm has a density of 2.77 g/cm³, which is outside the acceptable range.
The density of a basketball, on the other hand, is approximately 5646 kg/m³ or 89.91 kg/m³, depending on the source. This is calculated using the formula for density (ρ = m/V), where m is the mass of the ball and V is its volume. For instance, a basketball with a mass of 0.5 kg and a volume of 0.00557 m³ has a density of 89.91 kg/m³.
Therefore, based on the given examples, a baseball with a density of 2.77 g/cm³ is denser than a basketball with a density of 89.91 kg/m³, making the basketball lighter than the baseball. However, it is important to note that the density of basketballs and baseballs can vary depending on their size and composition. For instance, some basketballs may be lighter or heavier than others due to differences in their materials or manufacturing processes.
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Basketball materials
Basketballs are made from a variety of materials, with the most common being leather, synthetic leather, and rubber. The type of material used depends on factors such as the player's age, skill level, and playing surface.
Leather basketballs are made from 100% genuine leather and are designed for indoor use only. They have a hard feel when new, but over time they become softer and develop an appealing "broken-in" texture. Leather balls are the most expensive type and are not suitable for outdoor concrete or asphalt surfaces as these will roughen the leather.
Synthetic or composite leather basketballs are covered in artificial leather that has been designed to mimic the feel of genuine leather. They are cheaper to produce and do not need to be broken in as they already have a soft feel when new. These balls are suitable for both indoor and outdoor use and are available at various price points.
Rubber basketballs are lined with a rubber covering, making them ideal for outdoor concrete surfaces. They are durable and can withstand rougher playing surfaces. Rubber basketballs are perfect for beginners as they are the cheapest option and provide a good grip and fingertip control.
The weight of a basketball also varies depending on its size and the material used. For example, a Size 3 basketball for children aged 6 and under has a circumference of 22 inches and weighs 10 oz, while a Size 4 ball for the same age group but depending on their strength and development can have a circumference of 25.5 inches and weigh 14 oz. As players grow older and stronger, they can transition to larger and heavier basketballs, with the official size and weight varying between different leagues such as the NBA, WNBA, and NCAA.
Some popular brands that sell basketballs made from these materials include Spalding and Wilson, with the latter receiving praise from players for its indoor balls.
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Baseball materials
Baseballs are made of several materials. The core, or the "pill", is a small ball of cork, encased in two thin layers of rubber. This core is then wrapped in various layers of yarn, including wool yarn and polyester-cotton blend yarn. The ball is then coated with rubber cement and covered with two pieces of white cowhide. The baseball is then hand-stitched using red cotton thread.
The materials used to make baseballs have evolved over time. In 1909, Alfred J. Reach patented the idea of using ivory for the core of baseballs, but this was rejected by Benjamin F. Shibe, who had invented the cork-centred ball. Shibe's cork-centred ball was adopted by both leagues in 1910. In 1944, the introduction of synthetic rubber affected the performance of baseballs, with tighter-wound balls leaving the bat faster and flying further. The cover material of baseballs also changed in 1974, when cowhide replaced horsehide due to a shortage.
Soft compression baseballs, used for batting practice and fielding training, are typically made from polyurethane (PU) material. These baseballs are soft enough to be used indoors and are often used for softball.
The manufacturing process for baseballs has also undergone changes. In the past, companies such as Spalding and Reach manufactured baseballs for the National and American Leagues, respectively. However, in 1976, MLB ended its relationship with Spalding and switched to Rawlings, which still provides the balls for MLB today. The manufacturing process for Rawlings baseballs involves assembling raw materials imported from the United States and then shipping the assembled baseballs back.
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Frequently asked questions
Yes, basketballs are lighter than baseballs. A standard baseball weighs about 145 grams, whereas an official basketball generally weighs about 600 grams.
Basketballs are designed to be light so that they can be easily carried, shot, and dribbled during a game.
No, baseballs are denser than basketballs. Density is calculated as the ratio of mass to volume, and a baseball has a density of about 1.99 g/cm³, while a basketball has a density of approximately 1.00 g/cm³.
