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0.310 kilograms is about seven-tenths as heavy as a Football (Soccer)
In other words, it's 0.720 times the weight of a Football (Soccer), and the weight of a Football (Soccer) is 1.40 times that amount.
(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 0.410 kilograms and 0.450 kilograms. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
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