Have a circumference measuring not less than 68 cm (27 inches) and not more than 70 cm (28 inches) ...
It is a myth that the modern ball is lighter than the balls used in the past. Since 1937, the dry weight of the ball has been specified by Law 2: 14-16oz. Prior to that, the rules governing the ball’s dry weight specified something lighter – 13-15oz. This goes for the new ball used in 2010 just as much as it did for the 1966 ball.
Weight of an Official Soccer Ball FIFA and Soccer. FIFA, The Fédération Internationale de Football Association, the organization behind the World Cup,... Official Weight. FIFA-approved soccer balls come in two sizes, size 4 and size 5, according to FIFA's specification... Affect on Play. A properly ...
weight for a regulation size 5 ball. Team Handball: 15 to 16 3/4: 425 to 475: this is for the size III ball: Korfball: 15.7 to 16.7: 445 to 475: the size 5 ball for players >15 yrs. Weight when fully inflated. Football (Australian) 15.9 to 17.6: 450 to 500: A full size ball is a size 5: Croquet: 16: 453.6 : Basketball: 22: 623.7: weight for a regulation size 7 ball. Pétanque
between 410 g (14 oz) and 450 g (16 oz) in weight at the start of the match of a pressure equal to 0.6 – 1.1 atmosphere (600 – 1,100g/cm2) at sea level (8.5 lbs/sq in – 15.6 lbs/sq in) All balls used in matches played in an official competition organised under the auspices of FIFA or confederations must meet the requirements and bear one
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Regulation size and weight for a soccer ball is a circumference of 68–70 cm (27–28 in) and a weight of between 410–450 g (14–16 oz). The ball should be inflated to a pressure of 0.6 and 1.1 bars (8.7 and 16.0 psi) at sea level. 
This international match ball measures 27-28 inches in circumference according to the standard football sizes. It weighs between 14-16 ounces. This size is appropriate for everyone aged 12 and above. All the football leagues and tournaments all over the world use Size 5 football balls. These balls are also famous amongst the youth football games.
Law 2 of the game specifies that the ball is an air-filled sphere with a circumference of 68–70 cm (27–28 in), a weight of 410–450 g (14–16 oz), inflated to a pressure of 0.6 to 1.1 atmospheres (60–111 kPa or 8.7–16.1 psi) "at sea level", and covered in leather or "other suitable material".