Tennis Balls

The ball that is specifically used to play tennis is called the tennis ball. A tennis ball has an approximate diameter of 6.7 centimeters. Tennis balls are normally bright green in color. However, balls of other colors are also used for playing recreational tennis games. Tennis balls are layered with a fibrous fluffy felt that modifies the ball's aerodynamic properties. The tennis balls are normally green in color at all the major sporting events.

Standardization of Tennis Balls

Tennis balls should have a definite size and weight as well as follow a specific bounce and deformation criteria to be duly accepted for regulation play. The International Tennis Federation or ITF says that the official diameter of the ball should be between 65.41 millimeters and 68.58 millimeters. The weight of the balls should lie between 56 grams and 59.4 grams. The only two colors that are accepted by the International Tennis Federation and United States Tennis Association (USTA) are white and green. Most of the balls that are produced nowadays are fluorescent green or optic green in color. The optic green color was introduced for the first time in 1972 when researches demonstrated that these balls were more distinctly visible in a color television. Although tennis balls are generally fluorescent green in color, white tennis balls were again brought back into the market by in the year 2007. The air-filled tennis balls are uniformly covered with a felt rubber covering in its outer surface. The felt hinders smooth flow separation in boundary layer which lowers aerodynamic drag thus giving the ball improved flight properties. A number is also marked on the ball's outer surface apart from the brand name. This helps to differentiate one set of balls from another set with the same brand name.

Tennis Balls Tennis balls start losing their bounce once the tennis ball can is opened. The bounce of the balls can be tested by dropping them from a height of 2.54 meters onto a concrete surface. A bounce ranging between 1.3462 meters and 1.4732 meters is satisfactory provided the testing is carried out at the sea level at a temperature of 20 C. The high-altitude balls show different characteristic properties when they are tested at the sea level. Under modern regulations, tennis balls are maintained under pressure as long as they are initially used.

Pressure-less Balls

Pressure-less balls traditionally have a woodier, stiffer exterior than the pressurized balls. They also do not bounce as much as new pressurized balls. However, unlike the pressurized balls, pressure-less balls do not lose their bounce over time. As a matter of fact, pressure-less balls grow lighter with time due to loss of fuzz which makes them even more bouncier. With an increased baldness, pressure-less balls increase in their bounce, flight and spin. Some advanced forms of pressure-less balls have a similar feeling as that of the pressurized balls and have a far stronger durability than conventional tennis balls.