Thanks for the numbers.
What if the bone-dry footballs were at ambient temp in a hot room when they were pumped up to 12.5 psi, and they were then taken out to play in wet 40* weather? I wonder how much the psi would go down when the “hot” 80* air inside cooled down to 40*, especially when going from dry to wet, resulting in more pliable leather?
The wet leather would make the balls feel softer. Wet leather also stretches, allowing the volume of the envelope for air within to be larger, hence the psi drops even lower.
Just some ideas.
Yes, it’s going to make some difference, but not that much. I go back to the way it was found out. The Colts player that intercepted the ball noticed the difference. He knew it was out of specs, I’d think the refs should have known as well.
There’s a rubber bladder inside a football which would be unaffected by the moisture. Temperature, yes, but not the moisture.
Actually, there’s a rubber bladder inside the leather shell...the “stretch” factor should be practically non-existent.
I watched “How it’s made”, that’s how I know...
Exactly : pv=nrt
Now,did the weight change on any balls? (Wet after play)
How did the colt balls react? Were they all the same weight and pressure before and after?
Based on my understanding of the pv=nrt thing, dropping the temperature from 80F to 40F would drop the pressure about 8%, assuming the volume was unchanged.