What's the scientific reason for a coke can exploding when you shake it up?

Anybody?

 

I've nevr had one explode from shaking it. Though, I put one in the freezer to get it colder faster, and then forgot about it... That'll surely make it explode.

 

Its the forces of evil. I once read that in a holy book of sorts.

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Comic Book Guy

 

Theres no scientific explanation. Haven't you seent he new Coke commercial? Its all about karma.

 

When you shake up a coke can, the kinetic energy you transfer into it turns to heat. This heat causes the already pressurized can to become even more pressurized, as temperature and pressure are proportional.

PV=NRT in ideal situations, so pressure is proportional to molecules (moles) and temperature, and inversely proportional to volume.

 

Carbonated water is the base for soda. Carbonization "charges" water with Carbon Dioxide gas, giving it that fizziness. When you shake the soda, you agitate the mix, causing the CO2 gas to expand. Hence the exploding.






Eva_Pilot04,
Sodding, blimey, shagging, knickers, bollocks!

 

otehr words, a can of coke is full of liquid. you shake it up, the liquid becomes a gas, because the amount of heat increased from the amount of shaking. gas expands, and takes up more room then liquid. the aluminum can can not take the increase in presure, and it explodes.

 

duchess olga: no human being could shake a can enough to turn the liquid inside into a gas.

 

PV=NRT in ideal situations

wow that brings me back - it also explains why the can of coke explodes when it's in the freezer - if only life were as simple as physics....

 

duchess olga: no human being could shake a can enough to turn the liquid inside into a gas.

Not all of it no, Pixelito, but some of it yes. All you need is a little bit of gas for it to exploding. The sound that you hear when you first open a can or bottle is gas escaping

 

As Eva_Pilot said, there is CO2 mixed in with the soda. The soda water 'adsorbs' the gas, when you agitate the mix, the heat from the energy you add causes the gas to expand (it's possible some soda goes to gas too, given that the contents are under pressure).

 

My brother has this coke collection from all over the world. It's several years old and none have been opened. One day, a can from China or somewhere exploded and it ruined his entire bedroom. That can wasnt shaken up, but it just ate away at the inside of the can and finally got through.


BOOM!





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My brother has this coke collection from all over the world. It's several years old and none have been opened. One day, a can from China or somewhere exploded and it ruined his entire bedroom. That can wasnt shaken up, but it just ate away at the inside of the can and finally got through.


BOOM!

LOL, was he there at the time?

BTW all this scientific talk means nothing to me, confirming why i failed at science.

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Comic Book Guy

 

EvaPilot is closer to the right answer.

The shaking of a doesn't create enough heat to make any real difference.

What does happen is that to create the fizziness, CO(2) gas is forced into the water. However, this is not chemically bonded but instead it is more disolved into the water. But due to differences in the polarity of the molecules (water is polar and CO(2) isn't and in this case, opposites do not attract), they tend to seperate. When shaken, CO(2) molecules tend to come out of solution, going to a lower entropy state and also expanding in volume. When the can is openend, the difference in pressures pushes the soda out of the can and into your face.

 

I got this answer for a website that was answering a question about Why do people, before opening a carbonated drink which has been shaken, tap the top of the can with their finger so that it doesn't explode upon opening?. Here is the answer:

First let's consider the matter from a theoretical perspective. Carbonation is produced by forcing carbon dioxide into solution with H2O under pressure. Shake up the can and you create thousands of micro-size bubbles. Each bubble offers a tiny surface where CO2 can rapidly come out of solution, creating the potential for explosive fizzing should you open the can prematurely. Wait a while though, and the bubbles will float to the top of the can and disappear, and eventually all will be as before.

Here is the link to read more: Tapping Coke Can

 

and as the temperature decreases the gaseous CO2 becomes less and less soluble in the liquid thus building up pressure in the can and if cold enough, exploding in your freezer

 

Other way around. Most gases become less soluble in water (and other aqueous solutions, such as Coke) as the temperature increases.

The reason filled cans sometimes crack when you freeze them is water (and all aqueous solutions) reach maximum density at a temperature higher than 0 degrees Celsius. When you cool them all the way to the freezing point, they start expanding again and may break the container.