|
|
Post by ironhold on Jun 26, 2015 22:48:41 GMT
Myth: A soda does not need to be shaken to spray upon opening; one merely has to shake what the soda is attached to and the soda itself will be shaken by proxy.
This happened when I went to do the route this morning.
About halfway through, I stopped for a quick bathroom break. As it was still quite warm out even at three in the morning (in the 80s Fahrenheit IIRC and humid), I picked up a pair of 1-liter sodas on my way out the door.
Soda A was opened before I even got to the car. Soda B was randomly placed on my front passenger seat, where it was nestled between some of the bins I'm using for my newspapers.
I spent the next 80 minutes or so slowly nursing A. A was perfectly fine, with no problems whatsoever beyond the heat slowly raising the temperature of the soda.
When A was done, I went to open B. B sprayed soda all over my shirt and steering wheel.
B was resting snugly against the bins, and so did not itself actually move. The only thing I can think of is that the soda picked up the vibrations of the bins, which in turn were picking up the vibrations of the car itself being in motion.
|
|
|
|
Post by GTCGreg on Jun 26, 2015 22:54:37 GMT
Myth: A soda does not need to be shaken to spray upon opening; one merely has to shake what the soda is attached to and the soda itself will be shaken by proxy. I'm trying to figure out how you would shake the soda inside a bottle without also moving the bottle. |
|
|
|
Post by the light works on Jun 27, 2015 1:26:44 GMT
sounds to me like the question is more to the point of what counts as shaking the soda. - is vibration enough, or does there have to be actual jostling?
|
|
|
|
Post by silverdragon on Jun 27, 2015 7:38:53 GMT
The simple answer is Transport "shakes" the container.
I have extensive experience of Keg beer in transport, and any transport, even the most careful transport of a Firkin (9 gallon), you must leave it three days minimum for the sediment to settle out again.
Thus when a "beer tent" is set up for an outside event, the Live beer is transported close as soon as possible, and at least 24 hrs beforehand, is carried carefully to its final resting place for the event. If possible, the full three days.
OR...
NOT my own words.
So, in conclusion, shaking the car where a can of pop is resting, even on a cushion, you will shake the can.
|
|
|
|
Post by ironhold on Jun 30, 2015 12:48:27 GMT
Round 2 -
I opened up both sodas and took a sip of each before getting into the car.
When I opened up soda #2 after about 2.5 hours on the road, I got no explosion.
|
|
|
|
Post by the light works on Jun 30, 2015 14:03:16 GMT
Round 2 - I opened up both sodas and took a sip of each before getting into the car. When I opened up soda #2 after about 2.5 hours on the road, I got no explosion. I believe they are bottled at the factory with a much higher pressure than recapping them in ambient air generates - which would mean that once opened, they are not as sensitive. |
|
|
|
Post by GTCGreg on Jun 30, 2015 15:55:12 GMT
Round 2 - I opened up both sodas and took a sip of each before getting into the car. When I opened up soda #2 after about 2.5 hours on the road, I got no explosion. I believe they are bottled at the factory with a much higher pressure than recapping them in ambient air generates - which would mean that once opened, they are not as sensitive. The pressure in an unopened container of soda varies with temperature. When refrigerated at about 40ºF, the pressure is around 15 psi. At 70º, the pressure is twice as high at 30 psi. Opening the container reduces the pressure to 0 psi. This will cause the dissolved CO 2 to start to come out of the soda as small bubbles. If you recap the soda, the pressure will start to increase again as the CO 2 continues to come out of solution until an equilibrium is reached between the released gas pressure in the container and the pressure required to keep the gas that is still dissolved in the soda in solution. Since a lot of the dissolved gas has already escaped the container when you first opened it, the final recapped pressure will be a lot lower than the original pressure before opening it for the first time. Contrary to popular belief, the pressure inside a closed container of soda does not increase that much with shaking. So then why does soda shoot all over the place if you open a container that has been shaken? It's not because the pressure increases, but because shaking causes small amounts of gas (CO 2) to come out of solution in the form of small bubbles that stick to the sides and bottom of the container. When you suddenly reduce the pressure by opening the container, these small bubbles rapidly expand and force the soda out of the container. If you let the soda container sit still for a while after it is shaken, the small bubbles will return into solution and the soda will no longer explode out of the container when it is opened. It is a well known fact that slightly tapping the side a can of soda reduces the likelihood of a violent eruption when opening it. The reason for this is that any small bubbles that have formed on the side of the can are broken free and float to the space at the top. This reduces the amount of bubbles that can rapidly expand when the pressure is released and thus reduces the likelihood of liquid erupting from the can. |
|
|
|
Post by the light works on Jul 1, 2015 0:25:02 GMT
I believe they are bottled at the factory with a much higher pressure than recapping them in ambient air generates - which would mean that once opened, they are not as sensitive. The pressure in an unopened container of soda varies with temperature. When refrigerated at about 40ºF, the pressure is around 15 psi. At 70º, the pressure is twice as high at 30 psi. Opening the container reduces the pressure to 0 psi. This will cause the dissolved CO 2 to start to come out of the soda as small bubbles. If you recap the soda, the pressure will start to increase again as the CO 2 continues to come out of solution until an equilibrium is reached between the released gas pressure in the container and the pressure required to keep the gas that is still dissolved in the soda in solution. Since a lot of the dissolved gas has already escaped the container when you first opened it, the final recapped pressure will be a lot lower than the original pressure before opening it for the first time. Contrary to popular belief, the pressure inside a closed container of soda does not increase that much with shaking. So then why does soda shoot all over the place if you open a container that has been shaken? It's not because the pressure increases, but because shaking causes small amounts of gas (CO 2) to come out of solution in the form of small bubbles that stick to the sides and bottom of the container. When you suddenly reduce the pressure by opening the container, these small bubbles rapidly expand and force the soda out of the container. If you let the soda container sit still for a while after it is shaken, the small bubbles will return into solution and the soda will no longer explode out of the container when it is opened. It is a well known fact that slightly tapping the side a can of soda reduces the likelihood of a violent eruption when opening it. The reason for this is that any small bubbles that have formed on the side of the can are broken free and float to the space at the top. This reduces the amount of bubbles that can rapidly expand when the pressure is released and thus reduces the likelihood of liquid erupting from the can. that is the idea I had in mind, yes. drew a blank on the correct term for the amount of pressure it took to keep the gas in solution. |
|
