What Gas is in Soda? Discover the Bubbly Secret!

Have you ever wondered what makes soda so fizzy and bubbly? It’s a question that many people often ask, and in this article, we’ll explore the gas that’s in soda and the secret behind its bubbly goodness.

What Gas is in Soda

The gas that’s in soda is called carbon dioxide (CO2). It’s a colorless, odorless gas that’s found in the atmosphere and is also produced by humans and animals when they breathe. Carbon dioxide is a non-flammable gas that’s used for many purposes, including welding, carbonating beverages, and filling fire extinguishers.

Carbon dioxide is added to soda during the manufacturing process to create bubbles. The carbon dioxide dissolves in the water, and when the pressure is released by opening the cap or can, the gas rushes out of the solution and forms bubbles, creating the fizz in soda.

How Carbonation Works

The process of carbonation is what gives soda its fizzy texture, and it’s a complex process. The carbonation process starts with pressurizing water with CO2, which creates carbonic acid. This reaction is what gives soda its tangy taste.

When the cap or can is opened, the pressure that’s holding the CO2 in the liquid is released, and the carbonic acid becomes unstable. This causes the acid to break down into water and carbon dioxide gas, creating bubbles, and providing the fizzy sensation in your mouth.

What Makes Soda go Flat

Soda can go flat when it’s exposed to air for a period of time. The CO2 that’s released when the cap is opened will eventually escape into the air, which reduces the carbonation level and results in a flat taste.

  • Exposure to air: When the cap or can is opened, it allows the CO2 to escape, causing the soda to go flat.
  • Temperature: Carbon dioxide is less soluble in warm liquids than in cold ones. Therefore, keeping your soda cool will help preserve its fizziness.
  • Shaking: Shaking the soda can cause the CO2 to release too quickly, which can cause it to go flat more quickly.

Can You Re-Carbonate Flat Soda?

Yes, you can re-carbonate flat soda. There are different methods you can use to recarbonate flat soda, including:

  • Using a Soda Siphon: A soda siphon is a device that carbonates water. You can also use a soda siphon to recarbonate flat soda.
  • Carbonation Tablets: There are special carbonation tablets available that you can add to flat soda to restore its fizz.
  • Dry Ice: Adding dry ice to flat soda creates CO2, which carbonates the soda. However, you need to be careful when handling dry ice as it can cause injury if not handled properly.

The Science Behind the Fizz in Soda

As we’ve mentioned earlier, carbon dioxide dissolves in water and creates carbonic acid. When the cap or can is opened, the carbonic acid becomes unstable and breaks down into water and CO2 gas. This reaction creates carbon dioxide bubbles that provide the fizz in soda.

The amount of carbonation in soda affects its texture, feel, and taste. High levels of carbonation can create a sharp and tingling sensation in your mouth. This is why some sodas have a greater level of fizz than others.


The gas that’s in soda is carbon dioxide, which creates the bubbles and fizz that we all love. The process of carbonation is what gives soda its unique texture, taste, and feel. Knowing how carbonation works can help you preserve the fizziness of your soda, and also help you recarbonate flat soda. Understanding the science behind the fizz in soda can make you appreciate its bubbles and help you enjoy your soda even more.


  • Q: What happens when you drink too much carbonated soda?
  • A: Consuming too much carbonated soda can lead to bloating, indigestion, and stomach discomfort.
  • Q: Does shaking soda make it go flat faster?
  • A: Yes, shaking soda can cause the CO2 to release too quickly, which can cause it to go flat more quickly.
  • Q: What is the pH level of soda?
  • A: The pH level of soda ranges from 2.5 to 4.5, and it can vary depending on the type of soda.
  • Q: Can you carbonate any liquid?
  • A: Yes, you can carbonate any liquid as long as it’s water-based.


  • https://www.popsci.com/story/diy/how-to-carbonate-soda-flavors/
  • https://www.pickuplimes.com/single-post/2018/06/03/A-Scientific-Look-at-Carbonation-the-Bubbles-in-Soda
  • https://www.scripps.edu/science-and-medicine/exploring-the-science-of-food/cooking-and-cuisine-chemistry/graphic-science-of-soda-fizz/

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