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Altitude Impact On A Bottle Of Coke  
User currently offline707cmf From France, joined Mar 2002, 4885 posts, RR: 29
Posted (9 years 8 months 3 weeks 1 day 14 hours ago) and read 6792 times:

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

23 replies: All unread, jump to last
 
User currently offlineLimaFoxTango From Antigua and Barbuda, joined Jun 2004, 789 posts, RR: 1
Reply 1, posted (9 years 8 months 3 weeks 1 day 11 hours ago) and read 6701 times:

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.
User currently offlineAloges From Germany, joined Jan 2006, 8707 posts, RR: 42
Reply 2, posted (9 years 8 months 3 weeks 1 day 10 hours ago) and read 6693 times:

Nice demonstration! Same thing happens when the bottle gets cold.


Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
User currently offlineMADtoCAE From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 8 months 3 weeks 1 day 10 hours ago) and read 6681 times:

What happens when you do the reverse?

User currently offlineXnv From Canada, joined Jan 2000, 142 posts, RR: 0
Reply 4, posted (9 years 8 months 3 weeks 1 day 10 hours ago) and read 6674 times:

PV=nRT

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


User currently offlineGeoffm From United Kingdom, joined Feb 2004, 2111 posts, RR: 6
Reply 5, posted (9 years 8 months 3 weeks 1 day 9 hours ago) and read 6664 times:

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.


User currently offline707cmf From France, joined Mar 2002, 4885 posts, RR: 29
Reply 6, posted (9 years 8 months 3 weeks 1 day 9 hours ago) and read 6653 times:

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


User currently offlineAloges From Germany, joined Jan 2006, 8707 posts, RR: 42
Reply 7, posted (9 years 8 months 3 weeks 1 day 7 hours ago) and read 6595 times:

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]


Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 8, posted (9 years 8 months 3 weeks 1 day 5 hours ago) and read 6538 times:

Reminds me of the Ink pen Experiment in physics......
Don't try it but.....Shake the closed bottle & get Airborne,see what happens  Smile
regds
MEL



Think of the brighter side!
User currently offlineSATL382G From , joined Dec 1969, posts, RR:
Reply 9, posted (9 years 8 months 3 weeks 1 day 5 hours ago) and read 6519 times:

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


User currently offline242 From United States of America, joined Oct 2000, 498 posts, RR: 1
Reply 10, posted (9 years 8 months 3 weeks 23 hours ago) and read 6428 times:

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.

User currently offlineKDTWFlyer From United States of America, joined Jun 2004, 828 posts, RR: 1
Reply 11, posted (9 years 8 months 3 weeks 19 hours ago) and read 6357 times:

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  Smile


NW B744 B742 B753 B752 A333 A332 A320 A319 DC10 DC9 ARJ CRJ S340
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 12, posted (9 years 8 months 3 weeks 19 hours ago) and read 6354 times:

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



Think of the brighter side!
User currently offlinePilotpip From United States of America, joined Sep 2003, 3150 posts, RR: 10
Reply 13, posted (9 years 8 months 3 weeks 16 hours ago) and read 6323 times:

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
User currently offlineBuyantUkhaa From Mongolia, joined May 2004, 2899 posts, RR: 3
Reply 14, posted (9 years 8 months 2 weeks 5 days 8 hours ago) and read 6062 times:

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.
User currently offlineOly720man From United Kingdom, joined May 2004, 6737 posts, RR: 11
Reply 15, posted (9 years 8 months 2 weeks 5 days 7 hours ago) and read 6043 times:

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
User currently offlineTod From Denmark, joined Aug 2004, 1725 posts, RR: 3
Reply 16, posted (9 years 8 months 2 weeks 5 days 3 hours ago) and read 5984 times:

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  Nuts


User currently offlineLeezyjet From United Kingdom, joined Oct 2001, 4042 posts, RR: 53
Reply 17, posted (9 years 8 months 2 weeks 5 days 2 hours ago) and read 5969 times:

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.  Laugh out loud

 Smile



"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"
User currently offlineFlyf15 From , joined Dec 1969, posts, RR:
Reply 18, posted (9 years 8 months 2 weeks 5 days 2 hours ago) and read 5967 times:

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.  Big thumbs up


User currently offlineNewark777 From United States of America, joined Dec 2004, 9348 posts, RR: 29
Reply 19, posted (9 years 8 months 2 weeks 5 days 1 hour ago) and read 5955 times:

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?
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 59
Reply 20, posted (9 years 8 months 2 weeks 5 days 1 hour ago) and read 5945 times:
AIRLINERS.NET CREW
DATABASE EDITOR

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).  Big grin

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
User currently offlineUSAFHummer From United States of America, joined May 2000, 10685 posts, RR: 52
Reply 21, posted (9 years 8 months 2 weeks 5 days ago) and read 5937 times:

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



Chief A.net college football stadium self-pic guru
User currently offlineWbmech From , joined Dec 1969, posts, RR:
Reply 22, posted (9 years 8 months 2 weeks 4 days 23 hours ago) and read 5926 times:

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.

User currently offlineQantasA332 From Australia, joined Dec 2003, 1500 posts, RR: 25
Reply 23, posted (9 years 8 months 2 weeks 4 days 22 hours ago) and read 5908 times:

I know the experiment you're talking about, USAFHummer.  Big grin 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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