Why does soda fizz?

Category: Science

When we open the bottle of soda we always notice the fizz. This is because during the soda manufacturing large number of molecules of carbon dioxide gas are forced into the bottle and are dissolved at a pressure up to 1200 pounds per square inch in the water than it would be in the normal atmospheric conditions. This gas gets dissolve in the water and forms carbonic acid because of which it has tangy taste. The main aim is to force more and more molecules of carbon dioxide gas in the soda. The solution remains flat in the bottle until it is disturbed this is because carbon dioxide molecules does not separate from water and they are under liquid’s surface tension. Now when we open the bottle we release that pressure. It gains the energy to separate gas molecules and water. The room temperature enters into the bottle and the drink starts getting warmer quickly. Carbon dioxide also gets warmer and starts rising towards the surface in the form of bubbles because it has gained kinetic energy. After reaching the surface these bubbles pop.

Always a gas when dissolved in water separates itself from the solution explosively if it is suddenly disturbed. When we shake the bottle lots of small bubbles are created and the dissolved carbon dioxide joins these bubbles to vaporize quickly which results in more fizz.

Ice cubes added to the soda releases the dissolved gas into the soda which causes continuous fizz. One way to keep soda from getting flat easily is not to shake it and other is to cap the bottle tightly so that the room temperature cannot easily enter into the bottle and the liquid remains cool.

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25 Comments to “Why does soda fizz?”

  1. Amy says:


    My friends and I are having a bit of a debate. Hope you can help us resolve this…

    It appears that when soda is poured into a plastic cup, it bubbles much more than when it is poured into a glass or ceramic cup. I think that this might be due to the fact that the plastic cups surface is smoother and more “consistent” than a glass or cup that might be a bit more irregular and possibly microscopically “pitted”. The others think that there’s a chemical reaction occurring between the soda and the plastic. Can you please help us resolve this? Thanks!!! Great site!!


  2. savannah says:

    Amy you are right it is because the cracks or scrapes in other glasses kind of catch the Bubbles as of plastic cups do not

  3. Karina Lastre says:

    Wow, thanks for the info i was looking for some information about soda fizz for my science fair research paper and this really helped me. I learned a lot of stuff that i did not know about soda fizz and how it is created. Thanks a lot. 🙂

  4. Lexi says:


    Thanks for all the information, it was really helpful. I am doing a mini-project on the subject of chemical changes in soda and I was wondering what the citing information so that I can use this in my report. Please help quick because I only have a few days till I present. Thanks


  5. Alex says:


    Thanks for the info, it helped me alot. My science fair project is over whether flavored soda fizzes more than regular soda. I hope that I can get a good grade on it!

  6. letty says:

    thanks for the info it is awasome soo do you have any info abt chips n

    and why they have gas in the bag?

  7. Natalie Matvya says:

    Hi ,

    Thank you for the information and it really helped me for a science project and my essay

  8. klk says:

    Thank you for the information and it really helped me for a science project and my essay
    ??????? RMT
    aion RMT
    FF14 RMT
    ????? RMT

  9. kp says:

    Thank you for the information and it really helped me for a science project and my essay
    ??????? RMT
    aion RMT
    FF14 RMT
    ????? RMT

  10. Anne-Marie says:

    Thanks for the info, I’m working on a science fair project like everyone else. The whole does it fizz more in a certain kind of cup was interesting. Thanks again 🙂

  11. monica says:

    Dear Amy,

    i say that yuo are stupid andd have no life if that is all you and your so called “friends” have to talk about… i mean seriously who gives a s**t about that just drink your soda and be done with it.

    the end…problem solved

  12. Dominick Daniels says:

    Thanks, I did not know what to choose for my science fair project but know that i know all this. Now I know what to do for my Project.

  13. brianna says:


    thank you for the information it really helped me on the science project an i hope i get an A+

    and if i do its all thanks to you!!! thank you!!! <3333

  14. Madeline says:

    thanks for the info helped on science projectt!!!!!!

  15. Jasmine & Vivian says:

    thank you we need more info tho D: add more please (4 science project)

    *.* o_o

  16. Alyaa says:

    Thanks for the info.! It was very helpful!!


  17. bob jennings says:

    i dont know what you guys are talking about but your all wrong the pop itself decides whether it wants to or not

  18. Nathan says:

    ok this doesn’t make sence with the temp causing the pop to fizz. so if you opened the pop in a cold enviornment it won’t fizz? i figured equilbrillium was the reason pop fizzed. because if you open a pop it is slowly trying to reach equilbrillium. please answer me back.

  19. andrew says:

    hey monica you calling them stupid when you can’t spell. you spelt you with yuo and the word and the two d’s instead of one retard

  20. marryssa decaprioo says:

    thanks for this great site this will help me alot in the science fair at my school:)

  21. hershi says:

    Now my project is so easy!!!!!!!!!!!!!!!!!!

    Letusfindout rules!!!!!!!!!!!!!!!!!!!!

  22. shelly says:

    We just moved into a house that we are remodeling. Every time we open a can of soda, about half of it fizzes out of the can and all over the place. Every time! Never had this happen before moving into this house! Is there a reason? Something we should check? Thanks.

  23. Maddie says:

    He does the pop fizz react to different chemicals?

  24. A says:

    Hi what causes soda to fizz when you shake the bottle?

  25. A says:

    what causes soda to fizz when you pour salt in it

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