707CMF
Topic Author
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

Altitude Impact On A Bottle Of Coke

First flight of the year 2005 for me, and up in the French Alps to enjoy the snow and the mountains...

In order not to have any problems, we climb high, up to FL125 (13,000 Ft according to the current QNH). Up there, I am a bit thirsty, I drink some Coke (sorry for the free ad), and I close the bottle, tightening the cap.
Guess what it looked like once back on the ground !!!

Cheers and happy new year,

707

LimaFoxTango
Posts: 837
Joined: Wed Jun 16, 2004 11:33 pm

RE: Altitude Impact On A Bottle Of Coke

Cool! Next time, do the reverse and see what happens.
You are said to be a good pilot when your take-off's equal your landings.

aloges
Posts: 14842
Joined: Tue Jan 17, 2006 3:38 am

RE: Altitude Impact On A Bottle Of Coke

Nice demonstration! Same thing happens when the bottle gets cold.
Don't cry because it's over, smile because it happened.

MADtoCAE
Posts: 1094
Joined: Fri Sep 17, 2004 7:32 pm

RE: Altitude Impact On A Bottle Of Coke

What happens when you do the reverse?
Operator!!! Give me the number for 911!!

XNV
Posts: 141
Joined: Mon Jan 31, 2000 1:45 am

RE: Altitude Impact On A Bottle Of Coke

PV=nRT

Pressure and volume are directly proportional. As you go up, the atmospheric pressure decreases, and vice versa.

geoffm
Posts: 2082
Joined: Fri Feb 27, 2004 5:58 am

RE: Altitude Impact On A Bottle Of Coke

Can I suggest that you *don't* do that in reverse, lest you coat the instruments with coca cola...

We got taught the same sort of thing doing scuba diving. You don't need to go very deep for the same type of effect.

Geoff M.

707CMF
Topic Author
Posts: 4698
Joined: Thu Mar 14, 2002 5:39 pm

RE: Altitude Impact On A Bottle Of Coke

Actually, the 'reverse' has been made.

Obviously, since I had to climb with the bottle, the air inside has expanded prior to my opening the bottle.

However, due to the resistance of the bottle, it did not explode, nor even expand. Remember that Coke bottle have to resist high presures (if you shale a bottle of coke, air will be released from the soda, increasing the pressure inside the bottle).

So, except for a very hard coke bottle that I opened with a lot of care (do not want to have coke sprayed all over the instrument panel), there was no notable effect in the reversed manipulation.

Cheers,

707

aloges
Posts: 14842
Joined: Tue Jan 17, 2006 3:38 am

RE: Altitude Impact On A Bottle Of Coke

attention: nitpick ahead

"if you shale a bottle of coke, air will be released from the soda"

It's not air, it's CO2. Once you've shaken that bottle long enough, there'll be left too little carbonic acid (H2CO3) in the soda for you to notice the escaping CO2. (after the H2CO3 brakes down into H2O and CO2)

[Edited 2005-01-03 17:40:29]
Don't cry because it's over, smile because it happened.

HAWK21M
Posts: 30002
Joined: Fri Jan 05, 2001 10:05 pm

RE: Altitude Impact On A Bottle Of Coke

Reminds me of the Ink pen Experiment in physics......
Don't try it but.....Shake the closed bottle & get Airborne,see what happens
regds
MEL
I may not win often, but I damn well never lose!!!

SATL382G
Posts: 2679
Joined: Sat Aug 14, 2004 12:02 am

RE: Altitude Impact On A Bottle Of Coke

I'm not a physics expert but...

It occurs to me that the bottle was probably full of coke at the start of flight, correct? If so you didn't get a fair comparison of what happened during climb as compared to descent.

regards
"There’s nothing quite as exhilarating as being shot at and missed" --Winston Churchill

242
Posts: 495
Joined: Tue Oct 24, 2000 1:10 pm

RE: Altitude Impact On A Bottle Of Coke

We mechanics experience the very same thing when we pressurize an aircraft on the ground. We'll often hear pings and pops coming from the galley area due to the effects of cabin pressure on beverage containers.

KDTWflyer
Posts: 815
Joined: Tue Jun 29, 2004 12:51 pm

RE: Altitude Impact On A Bottle Of Coke

I did the same thing on a KLM Cityhopper flight between HAJ and AMS more than two years ago... I still have the "air from Germany" bottle in my room in its squashed state ever since
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HAWK21M
Posts: 30002
Joined: Fri Jan 05, 2001 10:05 pm

RE: Altitude Impact On A Bottle Of Coke

We mechanics experience the very same thing when we pressurize an aircraft on the ground. We'll often hear pings and pops coming from the galley area due to the effects of cabin pressure on beverage containers.

Even at times the noise from the Cabin interiors/Decorative panels due to Al Alloy metal expansion/contraction.

regds
MEL
I may not win often, but I damn well never lose!!!

pilotpip
Posts: 2830
Joined: Fri Sep 19, 2003 3:26 pm

RE: Altitude Impact On A Bottle Of Coke

you can do this with any liquid. Water works great too. I especially like closing my nalgene bottle in DEN and opening it back up as I go through the Eisehower Tunnel on I-70. It's amazing what 7,000 feet altitude changes do. It really makes you realize this. I did it once in the opposite direction but didn't open the bottle until I was in STL. I could barely get the lid to turn because of the vacuum.
DMI

Buyantukhaa
Posts: 2304
Joined: Thu May 13, 2004 5:33 am

RE: Altitude Impact On A Bottle Of Coke

On a side note: why does my beer can explode when I leave it in the freezer to long? Is it because CO2 dissolves less easily in ice? It was quite a bang, really...
I scratch my head, therefore I am.

oly720man
Posts: 5805
Joined: Fri May 21, 2004 7:13 am

RE: Altitude Impact On A Bottle Of Coke

Beer can... water expands as it becomes ice.

Although, I was once told, GIs during WW2 used to put beer cans in the freezer for long enough for the water to freeze, but not the alcohol and after the allotted time they would break open the can and drink the alcohol without suffering the volume problems of having to drink all the beer.
wheat and dairy can screw up your brain

Tod
Posts: 1709
Joined: Sat Aug 28, 2004 6:51 am

RE: Altitude Impact On A Bottle Of Coke

drink the alcohol without suffering the volume problems of having to drink all the beer.

It works.
I've done that unintentionally while trying to chill warm beer in a hurry

Leezyjet
Posts: 3544
Joined: Sun Oct 14, 2001 7:26 am

RE: Altitude Impact On A Bottle Of Coke

I have noticed the same thing too when meeting inbound flights. All the small water bottles in Upper class and the big ones in the galley's end up being twisted and contorted on arrival.

I enjoy going round opening them up and watching them pop back into shape - simple things so the saying goes !!.

Also just think if the pressure change is doing that to a plastic bottle, what is it doing to the inside of your body - although your body does have it's own pressure relief valve.

"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"

flyf15
Posts: 6633
Joined: Tue May 18, 1999 11:10 am

RE: Altitude Impact On A Bottle Of Coke

You don't have to worry about plastic soda bottles exploding if you did the reverse. These bottles are amazingly strong when it comes to being supplied with pressure from the inside.

My friends and I used to pump 2 liter bottles up to well beyond 100 psi and then shoot them with CTA (Switzerland)">BB guns. Like a small bomb going off....but, do not try this, it took massive amounts of stupidity on our part.

Newark777
Posts: 8284
Joined: Thu Dec 02, 2004 6:23 am

RE: Altitude Impact On A Bottle Of Coke

The reverse did happen to me, although it was in the cargo hold and involved a can or paint. Some moron put a can of paint in their bag on an American Eagle flight from Miami to the Bahamas, and it exploded, covering everyone's stuff with green paint. The guy took off before anyone realized what happened.

Harry
Why grab a Heine when you can grab a Busch?

2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: Altitude Impact On A Bottle Of Coke

Several years ago, I flew to OSH with some friends. We departed GRR, climbed to 13,000', and crossed over Lake Michigan (Despite an uneventful flight, it's something I'll never repeat in a single-engine airplane...the engine tends to make some awfully strange noises out toward the middle of the lake).

Upon reaching FL130, I went to grab my small bag of potato chips, and was alarmed to notice that the bag was bulging and ready to burst. I carefully depressurized the bag, and luckily avoided a potentially hazardous uncontained chip explosion.

It was a close call....

2H4
Intentionally Left Blank

USAFHummer
Posts: 10261
Joined: Thu May 18, 2000 12:22 pm

...

Call me scientifically naive, but this reminds me of a chemistry experiment we did back HS chemistry classes...had an open and empty Coke can, did something with heat to it, and it crushed itself in a flash...I dont remember much more than that, but Im sure those who are scientifically minded here do...this related to the original experiment done by the Elbonian?

Where the hell is "Mr. Wizard" when you need him...?

Greg
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wbmech
Posts: 121
Joined: Tue Aug 31, 2004 12:02 am

RE: Altitude Impact On A Bottle Of Coke

This is really a demonstration of air pressure. At altitude you open a bottle and the seal it with that altitude's air pressure trapped inside. Now descend to a lower altitude and the bottle shrinks and collapses. The heavier air at a lower altitude is causing the bottle filled with lighter air to collapse. Take a sealed bottle of air diving and the same thing will happen. It will collapse as you get deeper.

QantasA332
Posts: 1473
Joined: Sat Dec 13, 2003 5:47 pm

RE: Altitude Impact On A Bottle Of Coke

I know the experiment you're talking about, USAFHummer.   You take a soda can, put just enough water in it to cover the bottom, heat it over a burner until the water evaporates and fills the can with water vapor, then very quickly invert the mouth of the can into water. Inverting the can into water condenses the water vapor occupying the can, thus reducing the pressure inside the can enough to enable atmospheric pressure to crush it. This experiment and 707cmf's little discovery are pretty much slightly different manifestations of the same general principle, as you surmised.

Cheers,
QantasA332

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