-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
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| 1962 | I love to cook with wine. Sometimes I even put it in the food.
Guy-Lussac law using absolute pressure and including the compressiblity of nitrogen shows that physics could be responsible for a large portion of the drop
It also depends on the temp and location of the compressor.
Place five numbered balls into five refrigerators at five temps, and make one a chamber that sits 10 degrees above normal ambient.
Use 72F as a std. ambient point.
Place the compressor tanks in each fridge as well, and let them all settle out for some hours.
Fill each to exact calibration center point. Make measurements.
Cycle the balls through each fridge, settle time and fill and measure events. That way, you rule out ball to ball differences.
Collect data which can then be used as a baseline expected rule of thumb.
On game day, all balls should be stacked into a vertical, clear plexiglass box for ALL to see at ALL times. The ball boy gets balls from there feeding out of the bottom of the box. Once filled and inspected, they should get their fill valves SEALED, and get placed into the sideline boxes. Easy Greasy.
I don't know the dynamics of the bladder of a football, but that much pressure drop doesn't seem to me to fit "natural" deltas. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Maybe they fell for that tire inflation with N2 scam ?>:-} ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
By my math, the pressure drop (for 30F delta) should be about 0.72 PSI, actually less since the ball isn't rigid. Less than half of what the Prominent Boston Physicist got. Somebody could check this.
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John Larkin Highland Technology, Inc
picosecond timing laser drivers and controllers
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
I get an 11.4 PSI drop. Go thee unto: Click on Solve for P2 T1 = 273 + 70C = 343K T2 = 273 + 40C = 313K Click on Calculate and it produces an 11.4 PSI drop in pressure.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Oops. I made the same mistake as the Prominent Boston Physicist. P1 = 12.5 PSI as the initial pressure. The calculated P2 = 11.4 PSI. Pressure drop is 12.5 - 11.4 = 1.1 PSI
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
I'm not gonna mess with PVT calcs, but just thought I would let you know that no pro football game has ever been played at 70C, and no pro football game has ever been at 40C, at least during the winter.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
ESPN reports that 11 of 12 balls were 2 PSI below the legal limit of
12.5.
--
John Larkin Highland Technology, Inc
picosecond timing laser drivers and controllers
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Yes. Being elastic, the bladder/ball/entire containment actas as a spring for a small period of the deflation. Once past a certain point, however, it also relaxes, because it is not like a deflated balloon, where the expansion is several tens of percentage points.
Nice catch. The effect may be less than you equated due to the relaxation point not being very far from a mere couple pounds off "full". IOW, you may have given it more spring than it actually has.
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