The two important things to do to keep soda from going flat is to keep air out (so tighten the lid, and if possible squeeze the air out of the bottle before you do so), and keeping it cold. Keeping it in the refrigerator will prevent your soda from going flat a lot longer than leaving it out at room temperature.
Step 1: Why Is the CO2 Escaping Only AFTER We Open the Bottle??
Have you ever wondered why carbonated drinks run out of bubbles after a while, but it only happens after we opened the bottle?
The answer has to do with air pressure inside the bottle! It turns out that by keeping the bottle pressurized, bottles cannot form and escape the liquid. This happens because dissolved CO2 takes less volume than CO2 in gas form, and by keeping a the bottle pressurized were not letting those bubbles expand and form. So, the equilibrium state of the soda bottle is a state where the bubbles are dissolved in the liquid.
When we buy soda bottles they come pressurized (you can feel that the bottle is rock hard), but once we open them the pressure is released and the equilibrium state changes! Now, bubbles want to form and escape the liquid. Its not all bad news! We want this to happen, because otherwise we wouldnt get any fizziness when we drink it! The C02 would remain dissolved for ever.
But what happens when we want to keep the soda drink carbonated for a later time?
Well, if we keep the cap tight, bubbles can still escape the liquid! They keep escaping until the air pressure inside the bottle is high enough to stop them, but if your bottle has enough room in it, plenty of gas can escape the liquid before the formation of bubbles seize. This is why 90% full soda bottles remain carbonated longer than 50% full soda bottles do!
Solution to the Problem – Soda Companies Wished You Didnt Know This!
To stop the bubbles from escaping, we can actively pressurize the bottle (pump air to make the pressure higher) once were done drinking!
This works like magic – one moment you see bubbles escaping the liquid (practically going to waste!) and a moment later (after you pressurize the bottle) the is no more bubble formation!
Introduction: Keep Your Drinks Carbonated for Days (DIY Kitchen Accessory)
In this instructable Ill show you how to make a really simple kitchen accessory to keep your carbonated drinks fizzy for days (and more!) using only air pressure!
Theres almost nothing more disappointing than a soda drink with no bubbles. So I thought, there should be a simple solution for this! But I couldnt find one online, so I made one! Some people told me this could be made for profit, but honestly, I dont want to do that 🙂
Hope you enjoy my project and make your own!
I tried a bunch of different technique before posting this instructables – I made like 10 different versions of a 3-D printed air valves, but none were good enough. Eventually I decided to use a Schrader valve (the standard valve used in bicycles and cars). This turned out to be the simplest (and cheapest!) solution.
Heres a link to the valves I used (not an affiliate link). I tried a few other cheap ones, but these worked the best. Feel free to use any other valve though 🙂
Youll also need a suitable air pump (I didnt attach a link to this one, because mine broke just after a few weeks)
The Shortcut: Keep Your Soda From Going Flat
FAQ
How do you make soda not go flat?
Does squeezing soda bottle keep carbonation?
Why does my soda go flat so fast?
How do you keep soda from going flat?
To keep an unopened bottle of soda from going flat, keep it in a cool, dark place where the temperature will stay constant. Warm conditions will make the drink go flat faster as it’s easier for carbon dioxide to remain dissolved when it is cold.
Is soda good for you?
No, soda is one of the most harmful things. It is very rich in sugars and food additives, and does not contain any vitamins or minerals. Even the diet or zero versions are terrible for intestinal health, and are best avoided and only consumed on special occasions.
Should you throw away a flat soda?
Drinking a flat soda poses no danger to your health if it hasn’t spoiled, as the escaped carbon dioxide gas is not the main preservative. You can treat the drink like any other in terms of when it is sensible to throw it away.
Should you drink flat soda?
If you prefer flat soda, drinking it will be no risk. For some people who find the bubbles leave a bad aftertaste or dislike the texture of the bubbles, drinking a flat drink will be more pleasurable. Do you remember being given flat soda for an upset tummy – it was one way our parents tried to keep us hydrated when we were sick.