How much would a 30 degree F temp difference impact the pressure?

From my understanding...correct me if I'm wrong

Temp outside: 45F / 7C
Temp inside: 75 F 24 C (for sake of argument)

In Kelvin:
Outside = 273 + 7 = 280
Inside = 273 + 24 = 297

Initial Pressure 12.5psi. Absolute pressure 14.7psi + 12.5psi = 27.2 psi
ratio 280 / 297 = .942
Absolute pressure outside = .942 * 27.2 = 25.6
Guage pressure outside = 25.6 - 14.7 or 10.9 psi

Now maybe it was 70 degrees (21C) inside, then it'd be 11.2 psi. Same general idea.

So why isn't this being discussed nationally?

Or am I doing it wrong?

kennyb said:

From my understanding...correct me if I'm wrong

Temp outside: 45F / 7C
Temp inside: 75 F 24 C (for sake of argument)

In Kelvin:
Outside = 273 + 7 = 280
Inside = 273 + 24 = 297

Initial Pressure 12.5psi. Absolute pressure 14.7psi + 12.5psi = 27.2 psi
ratio 280 / 297 = .942
Absolute pressure outside = .942 * 27.2 = 25.6
Guage pressure outside = 25.6 - 14.7 or 10.9 psi

Now maybe it was 70 degrees (21C) inside, then it'd be 11.2 psi. Same general idea.

So why isn't this being discussed nationally?

Or am I doing it wrong?

Click to expand...

Sorry, that's too intelligent for Goodell, ESPN or 99% of America.

kennyb said:

From my understanding...correct me if I'm wrong

Temp outside: 45F / 7C
Temp inside: 75 F 24 C (for sake of argument)

In Kelvin:
Outside = 273 + 7 = 280
Inside = 273 + 24 = 297

Initial Pressure 12.5psi. Absolute pressure 14.7psi + 12.5psi = 27.2 psi
ratio 280 / 297 = .942
Absolute pressure outside = .942 * 27.2 = 25.6
Guage pressure outside = 25.6 - 14.7 or 10.9 psi

Now maybe it was 70 degrees (21C) inside, then it'd be 11.2 psi. Same general idea.

So why isn't this being discussed nationally?

Or am I doing it wrong?

Click to expand...

I think the analyses done on this already missed the absolute vs. gauge pressure distinction.

Maybe BB was inflating them in ovens so it would really drop.

Kjmass1 said:

Maybe BB was inflating them in ovens so it would really drop.

Click to expand...

that's a possibility, but given these temperature differences, if I've done it right, he wouldn't have had to resort to that.

Can these things stay in one thread?

my guess is we kept balls in sauna or in a very hot room and inflated the balls just prior to testing.

looking at quick google search it says average temperature of sauna is 150-175 degrees.

so my question is this. if balls were infalted in sauna as i would think, and we filled the balls to minimum 12.5 psi, what effect would there be if balls were tested by league in climate controlled 70 degree office?

I have no idea who to trust with this. I've seen a bunch of people do the math on this. With results ranging from very possible that it was all the weather, to not at all possible.

kennyb said:

Temp inside: 75 F 24 C (for sake of argument)

Click to expand...

The media would find a way to turn the temp inside of gillette into a "cheatriots" story.

"Patriots investigated for keeping opposing teams in sauna like conditions" reports ben volin, when reached for comment Colts owner Jim Irsay had this to say "I'm dyinggggggg I'M DYINGGGGG! It feels like my skin is falling off, GAHHHHHHHH give me my coke GIVE ME MY COKE!!!!"

Local medical professionals mentioned that it appeared the Irsay was going into expediated narcotic withdrawls, however a doctor in Indianapolis was quoted as saying that hot humid conditions can't possibly make someone sweat out toxins.

billdog3484 said:

my guess is we kept balls in sauna or in a very hot room and inflated the balls just prior to testing.

looking at quick google search it says average temperature of sauna is 150-175 degrees.

so my question is this. if balls were infalted in sauna as i would think, and we filled the balls to minimum 12.5 psi, what effect would there be if balls were tested by league in climate controlled 70 degree office?

Click to expand...

That's similar to my question. If they were 12.5 at 150 degrees, then they'd be about 9psi at 70 degrees.

Don't make people use science and math! HOW DARE YOU!

Marinlik said:

I have no idea who to trust with this. I've seen a bunch of people do the math on this. With results ranging from very possible that it was all the weather, to not at all possible.

Click to expand...

The calculation posted above is correct. Most people saying the pressure can't reduce by approx. 1.5psi due to weather are not adding in the atmospheric pressure.

But if temperature difference was the only thing at play - balls in every cold weather game would be horribly underinflated, right? I mean the Baltimore game was 30 degrees below the Colts game.

Surely the sensible thing to do would be to check the air pressure of the Colts balls too.

If they are also below what they should be, then it's due to adverse weather. Conspiracy over. Controversy over. Superbowl talk resumes.

Darrone said:

But if temperature difference was the only thing at play - balls in every cold weather game would be horribly underinflated, right? I mean the Baltimore game was 30 degrees below the Colts game.

Click to expand...

Yes, good point. It'd be about 9.8 using this equation (at 20 degrees F).

BUT...

The leather insulates the air (possibly). HOWEVER if it's raining then the rain conducts heat away from the leather much more effectively. Thus reducing the temperature.

Thus in the 20 degree (F) game the ball may have been relatively warm 50 or 60 degrees for the whole game. Who knows.

Think about being in 30 degree air vs. 30 degree water. Which feels colder? That's because the water is much better at sucking heat from you.

kennyb said:

The leather insulates the air (possibly). HOWEVER if it's raining then the rain conducts heat away from the leather much more effectively. Thus reducing the temperature.

Click to expand...

That's really stretching it. You are starting with a conclusion and working backwards.

I went to the bronco game in 2013. There is no way you can tell me that with that temperature, and that wind, that those balls were less-affected than a 35 degree rainy day.

Darrone said:

That's really stretching it. You are starting with a conclusion and working backwards.

I went to the bronco game in 2013. There is no way you can tell me that with that temperature, and that wind, that those balls were less-affected than a 35 degree rainy day.

Click to expand...

no different than simply laying the blame on BB.......when it is very possible he knew nothing about it

Darrone said:

That's really stretching it. You are starting with a conclusion and working backwards.

I went to the bronco game in 2013. There is no way you can tell me that with that temperature, and that wind, that those balls were less-affected than a 35 degree rainy day.

Click to expand...

I'm not saying they were. But remember, the refs didn't even NOTICE that the balls in the game were off.

SO maybe the balls in the 35 degree rainy day were off too and just not checked?

If you don't check balls ever and then the one time you do and they're off, how do you know they're not always off in said conditions?

I have a friend, who has a friend, who has a third cousin who used to date Bill Belichick's housekeeper's daughter. Apparently the Pats inflate their balls in a specially designed pizza oven, to exact specifications. But because of the hot air, when the balls get outside they experience significant shrinkage!

Username said:

Surely the sensible thing to do would be to check the air pressure of the Colts balls too.

If they are also below what they should be, then it's due to adverse weather. Conspiracy over. Controversy over. Superbowl talk resumes.

Click to expand...

The problem there is Maybe Luck 'Aaron Rodgers' his balls, and submits them at 13.5 or 14psi

If they dropped 1.5 psi they would still be at the legal minimum. where as brady might like them at 12.5 and that causes them to drop to 11.