PV=mRT

[DAB]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.

[Datawiz]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.

Very astute observation. I wonder of the NFL will consider this fact.

[8Up]

I was kind of thinking that too. what was the temp when the balls were checked pre-game vs temp when the balls were rechecked after the complaint.

[DAB]

Very astute observation. I wonder of the NFL will consider this fact.

No.

Boston. Plenty of smart kids in the area.

Read that the nfl banned teams from warming balls. How about chilling them? Warming would make a harder ball. :slap: bet very few players know about gas laws.

[DAB]

I was kind of thinking that too. what was the temp when the balls were checked pre-game vs temp when the balls were rechecked after the complaint.

I'm betting they are prepped and checked indoors. But if you check them again on the sideline, well duh, they've cooled down.

[mrvette]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.

Fizz Icks 101......good point.....never thought of it....

:rofl::kick::dance:

[Cybercowboy]

Would it explain why their balls were at a lower pressure on the field than the Colt's balls? Nope. I assume that's something they looked into?

[DAB]

Would it explain why their balls were at a lower pressure on the field than the Colt's balls? Nope. I assume that's something they looked into?

depends on what the starting pressure and temperature were. and how the balls were checked during the game or at halftime.

not an issue for indoor games, as the temperature variation is almost zero.

[C5SilverBullet]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.
Only problem is that when all 24 balls were inspected at halftime, only the 12 Patriots footballs were deflated.

[Cybercowboy]

Only problem is that when all 24 balls were inspected at halftime, only the 12 Patriots footballs were deflated.

Eggszactly.

[RedLS1GTO]

PV=nRT

:leaving:

[8Up]

Only problem is that when all 24 balls were inspected at halftime, only the 12 Patriots footballs were deflated.

Does it say they were all pre-checked in the same place?

[Mike Mercury]

The refs also provide their own set of balls, to be used for kicking plays only. These balls never get into the hands of the teams. That is why you'll see kickers "work" the ball right before kicking it. They are new, inspected, and untouched by anyone other than the refs themselves.

The Colts reportedly grew suspicious after linebacker D’Qwell Jackson intercepted Tom Brady late in the second quarter.

Jackson gave the ball to a member of the Colts’ equipment staff, who notified coach Chuck Pagano, who then relayed a message to general manager Ryan Grigson in the press box. He contacted Mike Kensil, NFL director of football operations, who then told the on-field officials at halftime.

On the first play from scrimmage after the opening kickoff of the third quarter, the officials held up the game for a minute and ultimately switched out the game ball. Former NFL official Mike Carey, working the broadcast booth for CBS, surmised that “It looks like they (swapped) the ball for a kicking ball..."


and the rest:
Per the NFL rulebook, each team provides game officials with 12 footballs before the game, and the balls are required to be inflated between 12½ and 13½ pounds per square inch. The referee inspects the game balls 2 hours and 15 minutes before kickoff, places a special marking on each ball that passes inspection, and hands the approved balls to attendants on each team, who are supposed to maintain custody of the balls on each sideline.

[Mike Mercury]

oh, and...

Each team uses its own football on offense — a 2013 New York Times article said that each team even has its own logo on the football when on offense — and teams are allowed to slightly doctor the footballs to their preference. “Rubbing up” the football with dirt to make it less slippery is common, and so is slightly adjusting the inflation levels.

Packers quarterback Aaron Rodgers likes to overinflate the football. When the Packers and Patriots played on Nov. 30, CBS broadcaster Phil Simms relayed a conversation he had with Rodgers.

“He said something which was unique. ‘I like to push the limit to how much air we can put in the football, even go over what they allow you to do, and see if the officials take the air out of it,’” Simms said of Rodgers. “Because he thinks it’s easy for him to grip. He likes them tight.”

Rodgers defended the practice Tuesday on his radio show on ESPN Milwaukee.

“It’s not an advantage when you have a football that’s inflated more than average air pressure. We’re not kicking these footballs,” he said.

[Fastguy]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.

Especially when its freezing rain out.

[Cybercowboy]

A 12.5 psi ball at 70F will be a 10.9 psi ball at 40F

Gas laws apply to the NFL too.

This equation uses absolute zero for the temp delta.

40 + 454 = 494
70 + 454 = 524

Assuming n, R, and V remain the same, the pressure change would be:

(494/524)*12.5 = 11.78 lbs/in^2

I'm doing this from memory, and admit I could be wrong, but I don't think so.

[Superstreet]

Fill them with a high purity nitrogen gas.

[C5SilverBullet]

Does it say they were all pre-checked in the same place?
The referee checks them 2 hours before the game, then the team gets them back 10 minutes before kickoff.

[Fastguy]

The temp dropped rapidly that night after sundown, freezing rain didn't help. I am just curious why no other team has ever asked to have balls checked after a game, especially at Gillette stadium, where the temp always drops rapidly during a night game. It would be interesting for them to inflate them, let them sit outside for a few hours and then re-check them.

[RedLS1GTO]

We're talking about New England... look at the games they play each year. It's not like they are a warm weather team that found themselves in an uncommon situation playing in cold weather.

The Colts reportedly grew suspicious after linebacker D’Qwell Jackson intercepted Tom Brady late in the second quarter.

If Jackson noticed it immediately, do you really think Tom Brady and the rest of the Patriots didn't?

IF they really were low, ... so low that a LINEBACKER felt the difference... they knew it and they did it on purpose. Period.

[C5SilverBullet]

The temp dropped rapidly that night after sundown, freezing rain didn't help. I am just curious why no other team has ever asked to have balls checked after a game, especially at Gillette stadium, where the temp always drops rapidly during a night game. It would be interesting for them to inflate them, let them sit outside for a few hours and then re-check them.
They were checked at half time, and only the Patriots 12 balls were underinflated, the Colts 12 were still in line.

[Cybercowboy]

The temp dropped rapidly that night after sundown, freezing rain didn't help. I am just curious why no other team has ever asked to have balls checked after a game, especially at Gillette stadium, where the temp always drops rapidly during a night game. It would be interesting for them to inflate them, let them sit outside for a few hours and then re-check them.

About 0.7 psi drop for each 30 degrees. Even if it dropped from 40F to 10F (which in no way was it that cold) they would have only gone down 1.4 psi. But the real indicator was all 12 of the Colts balls were fine, and 11 out of 12 of the Pats balls were 2 psi lower.

[Aerovette]

What is the allowable inflation range?

[Mike Mercury]

What is the allowable inflation range?

the range for pre-game inspection needs to be 12.5 to 13.5 psi.

[Sea Six]

My ex-girlfriend still has custody of my balls.






Court order. :smash:

[Mike Mercury]

My...girlfriend has custody of my balls.


roll them around... like planets

[DAB]

R= F+460

[GentleBen]

They were checked at half time, and only the Patriots 12 balls were underinflated, the Colts 12 were still in line.

Not doubting the veracity of your statement but could you please post the link where it states that the Colt's footballs were checked at half time? I haven't seen that posted anywhere.

As for the Patriots balls loosing pressure in accordance with Boyle's Law of Gasses, if the Patriots footballs lost approximately .75 psi due to a rapid drop in temperature between the pressure reading two hours prior to game time and taken inside a putative 72* locker room, why weren't the Colt's footballs similarly low on pressure? Could that mean that the Colt's footballs were overly pressurized after the officials inspection?

Please understand, I have no dog in this fight as I am a die-hard Packers fan.

[Y2Kvert4me]

Gas laws apply to the NFL too.Probably have for the past 95 years as well.

What makes this game different?

[DAB]

Probably have for the past 95 years as well.

What makes this game different?

It's now someone else's fault that you got your ass kicked. Any excuse will do.

[DAB]

you can run your own comparisons

P1/T1=P2/T2

use absolute temp and pressure

Rankine = F+460

pressure = psig+14.7

[Y2Kvert4me]

I sense an opportunity to develop the revolutionary new FPMS...Football Pressure Monitoring System.
A small sensor embedded in each football, providing wireless transmission of real time internal football pressures to the team and officiating crew.

Hey, it became mandated on cars. :island14:


24 balls per game, 300+ total games per season...I'm gonna be rich! :hurray:

[DAB]

I sense an opportunity to develop the revolutionary new FPMS...Football Pressure Monitoring System.
A small sensor embedded in each football, providing wireless transmission of real time internal football pressures to the team and officiating crew.

Hey, it became mandated on cars. :island14:


24 balls per game, 300+ total games per season...I'm gonna be rich! :hurray:

call GM, modify the TPMS into the FBPMS :dance::dance:

receiver on the sideline grabs the pressure, posts it on the scoreboard. gets too low, flashes red, ball is pulled and inflated.....

:rolleyes:

[DAB]

actually 36 balls/game: 12 home, 12 away, 12 home reserve, plus the kicker balls (unknown qty)

[DAB]

simple solution:

home team brings their balls, visitors bring theirs. you can use whatever ball you want. send the QBs over to fondle the balls before kickoff, they can determine if any are particularly suitable (more then their own), make notes, done.

that'll be $50 for free advice.

[C5SilverBullet]

Not doubting the veracity of your statement but could you please post the link where it states that the Colt's footballs were checked at half time? I haven't seen that posted anywhere.

As for the Patriots balls loosing pressure in accordance with Boyle's Law of Gasses, if the Patriots footballs lost approximately .75 psi due to a rapid drop in temperature between the pressure reading two hours prior to game time and taken inside a putative 72* locker room, why weren't the Colt's footballs similarly low on pressure? Could that mean that the Colt's footballs were overly pressurized after the officials inspection?

Please understand, I have no dog in this fight as I am a die-hard Packers fan.
The former head of officials said it on Mike & Mike this morning.

[lspencer534]

simple solution:

home team brings their balls, visitors bring theirs. you can use whatever ball you want. send the QBs over to fondle the balls before kickoff, they can determine if any are particularly suitable (more then their own), make notes, done.

that'll be $50 for free advice.

Why does each team have its own balls? (No pun intended) Seems like if both teams used common balls, we wouldn't have to wonder about these things.

[C5SilverBullet]

Gerry Austin, NFL - ESPN (http://espn.go.com/espnradio/play?id=12204030)