Football
The fixture, known as El Clásico, is one of the most renowned in sport. Players are cautioned with a yellow card, and dismissed from the game with a red card. These colours were first introduced at the 1970 FIFA World Cup and used consistently since. The ball is spherical with a circumference of between 68 and 70 cm , a weight in the range of 410 to 450 g , and a pressure between 0.6 and 1.1 standard atmospheres (8.5 and 15.6 pounds per square inch) at sea level. In the past the ball was made up of leather panels sewn together, with a latex bladder for pressurisation but modern balls at all levels of the game are now synthetic. Three Australians Selected As Part Of Fifa's Female Coaching Education Scholarships Each half runs continuously, meaning that the clock is not stopped when the ball is out of play. The referee is the official timekeeper for the match, and may make an allowance for time lost through substitutions, injured players requiring attention, or other stoppages. T...