Don’t kick me if this sounds like a “good housekeeping” tip
But am sure there are lotsa more bachelors out there livin on a diet of Maggi and Coke who would surely appreciate this…
The 2L coke (or Pepsi for dat amtter bottles are the most cost-eefective drink that go well with any meal that bachelors (or single working women) survive on,The only hitch is they lose the fizz real fast once opened even if you screw the cap tight… within a day or two…
Some scientific analysis on why factory sealed bottles don’t lose their fizz while losing it once opened led to a good tactic that I employ…Works perfectly…
Once you’ve taken out ur quota of a glass, Just squeeze the bottle so that the precious liquid comes almost to the top and is on the verge of spilling out…Tighten the cap and put it back in the fridge…
Next time you open it, it’ll be as fresh and fizzy as ever…Just ensure that you emply the same squeeze and cap technique every time you open the bottle…
I thought that if a factory ppacked bottle can stays fizzy for ages, why does it lose it once opened even though the cap is airtight…
Then it struck me that once u open the bottle, and take out some of the “my precious”
the air that gets left on the top is the culprit…drive that out & voila
I can’t really say how long it’ stay fizzy coz i haven’t seen a bottle lasting more than 5 days at myplace at max…but on a course of 5 days, it doesn’t perceptibly lose out on any fizz…
Once you’ve taken out ur quota of a glass, Just squeeze the bottle so that the precious liquid comes almost to the top and is on the verge of spilling out…Tighten the cap and put it back in the fridge…
Next time you open it, it’ll be as fresh and fizzy as ever…Just ensure that you emply the same squeeze and cap technique every time you open the bottle…
The Gas tries expand? Causing the bottle to get back to its original shape in a few hours.
The reason for the Coke getting “Defizzed” is cuz thats the nature of Carbonated water. It isn’t really stable, as in, as soon as you pour it out, the Carbon dioxide in the water escapes as bubbles. So if you were to squeeze the bottle, the bottle would try to come back to it’s original shape, i.e due to the decreased pressure inside. So as the volume of the bottle increases, the gas from the Coke would be forced out. So you’d be left with the sweet liquid at the bottom, and gas on the top. When you open the bottle, the gas on top would escape, and you’d be left with the liquid with trace amounts of carbon dioxide.
Thats my theory, and observation atleast.
Regards
Inzider
Edit - Just to prove myself right, i opened a Coke bottle, drank half of it , and squeezed the bottle and put it back into the fridge. In about as much time as it took me to type this full post out, and another post somewhere else, the bottle was back to half it’s original volume, and the fizz on the surface could be seen. Clearly, the drink was getting defizzed. It wasn’t fresh either, even though the bottle had been opened hardly 10 mins ago, and spent most of that 10 minutes tightly shut
I wouldn’t agree to that…I do this all the time…even now when I am in office, there’s a 3 day old coke bottle squeezed to the hilt lying in my fridge, and it’’ be as fizzy (almost) as new when i go back home
The only reason i cud think of why it cud have possibly happened if the following was not entirely true in ur case..
Either that^^ or the fact that u opened a bottle from which some of its contents had already been consumed before and hence most of the CO2 u r talking about would have already made way to the atmosphere..
Hmmm…hows this one? The bottles are filled and sealed in the factory using high pressure, isnt it? At the high pressure, CO2 dissolves in the water but becomes unstable and released at normal pressures. When you squeeze the bottle and shut tight, the plasticity in the bottle tries to regain its shape and this force exerts pressure on the insides. A high pressure is thus created inside the bottle keeping the CO2 retained in the water.
@hellfire
Actually, i think i low pressure is created. This is how. When you squeeze the bottle, all the air is thrown out. Then you cap the bottle. Now, the volume of air inside is less. The bottle is trying to regain it’s old shape. So notice, that if you were to open the cap a little, air would rush in. This indicates that the pressure inside the bottle is less than outside. If there was highpressure inside, when you squeeze the bottle as indicated, and later open it, all the drink should flow out.
bottles are the most cost-eefective drink that go well with any meal that bachelors (or single working women) survive on,The only hitch is they lose the fizz real fast once opened even if you screw the cap tight… 
within a day or two…
, and squeezed the bottle and put it back into the fridge. In about as much time as it took me to type this full post out, and another post somewhere else, the bottle was back to half it’s original volume, and the fizz on the surface could be seen. Clearly, the drink was getting defizzed. It wasn’t fresh either, even though the bottle had been opened hardly 10 mins ago, and spent most of that 10 minutes tightly shut 