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In any FIFA World Cup or UEFA competition or the Barclays Premier League and other professional football matches, what type of air is the ball filled with?

Are there any regulations on the type of air used?

  • HWy do you think I could not be air? Do you know any sport, balls are not filled with air? ...except from table tennis – Phab Jan 22 '16 at 6:39
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    It's be kind of fun to play with a ball filled with helium. – Dawood ibn Kareem Apr 4 '17 at 4:21
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Just plain old regular air. 78% nitrogen, 21% oxygen, 1% other stuff.

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