Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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?
Just plain old regular air. 78% nitrogen, 21% oxygen, 1% other stuff.
Required, but never shown
3 years, 6 months ago
2 months ago