How is beer carbonated?

In this brief guide, we are going to answer the question “how is beer carbonated” with an in-depth analysis of the processes used for yeast carbonation. Moreover, we are going to highlight what is natural and forced carbonation, what are the methods of natural and forced carbonation, and what sugars can be selected for adding to the bottles.

How is beer carbonated?

The Beer is carbonated in two ways, natural carbonation, and forced carbonation. Carbonation is the addition of carbon dioxide gas in beer. The addition of carbon dioxide is done under the pressure and almost all the Beers available in the markets are carbonated.


Carbonation is defined as the addition of carbon dioxide gas into a liquid under pressure. In beer, the pressure is usually put in the form of a sealed cap Or lid. When the little cap is opened, the carbon dioxide gas rises to escape in the form of bubbles that is a sign of carbonation of a beverage.

In beers, the carbonation is done in two main ways: common natural and forced carbonation. In both cases, beer and carbon dioxide are packed in a container, the closed lid of which exerts pressure inside the container.

Natural carbonation

Natural carbonation results from the fermentation process in which alcohol and carbon dioxide are produced as a result of the digestion of sugar by yeasts. The beer is usually brewed In a container that is sealed but most of the carbon dioxide is released throughout the process. For this reason, the Brewer usually sees the container to prevent the escape of carbon dioxide from it.

Natural carbonation is also done in bottles where the beer is allowed to ferment completely. In this case, David is poured into the bottle from the fermenter without the process of filtration that allows the transformation of yeast along with beer into the bottles.

The bottles were then added with some amount of sugar that can be an important factor for the functioning of yeast inside the bottle. The yeast starts to format this sugar as a result of which alcohol and carbon dioxide are produced.

Forced carbonation

To allow complete fermentation, beer is also carbonated forcefully. In this case, the carbon dioxide is pumped into this sealed container containing beer with the help of external pressure. As a result, carbon dioxide is absorbed into the liquid. The forced carbonation method is commonly used for kegs where the carbon dioxide is pumped into the keg containing beer once it has been refrigerated.

Method of natural carbonation

Natural carbonation is done through the use of natural yeast in a closed container, such as a fermenter or bottle. Here, we are going to discuss the natural carbonation in bottles.

Bottle conditioning process

For bottle conditioning, one may need to follow the different steps.

Sanitize the bottles before transferring beer into them. This is particularly done to clear any unwanted germs or bacteria that may have the potential to contaminate the fear and then alter the flavor, texture, and aroma of the beer. These terms can also alter the normal activity of the yeast present in beer that is an important factor for carrying out the carbonation process.

Before pulling the beer into bottles, make sure that the permutation has been completed. If the fermentation is not completed, the second fermentation will not be much effective in producing the desired properties in the beer.

During bottle conditioning, the right temperature should also be maintained. This temperature is normally the same as the temperature that is capped during fermentation and the beer should not be exposed to the sunlight as it may alter the working of yeast inside it.

Always try to teach beer before shifting it into the bottles as it may be a good indicator of assessing The extent of fermentation in your beer.

The quantity, as well as the quality of sugar that is going to be added into the beer bottles, should be properly handled and managed. It may have a direct impact on the end product.

To allow the full fermentation in bottles, the beer bottle should be stored at about 70 to 75 degrees Fahrenheit for two to three weeks after priming and filling into bottles. This duration and temperature are considered enough for four wonderful fermentation processes.

Method of forced carbonation

Post carbonation is mainly done in the keg where pressure is released through a wall. It is usually done through two main methods.

Method #1

During this method, carbon dioxide is exerted under low pressure for a longer duration of time.

  • Make sure that the gas line is free of any leaks. Insert the carbon dioxide gas under pressure through the release of the valve in the keg. It may allow the circulation of gas throughout the container. 
  • The sound of circulation may be heard just like some bubbling, which will indicate that carbon dioxide is properly running through the cylinder, regulator, gas line, Drip does you, and beer.
  • Once you are sure that the system is working properly, increase the pressure by adjusting the regulator to 20 PSI.
  • Allow the carbonation for seven to 10 days and then check the carbonation level.

Method # 2

During this method, the beard is carbonated at a faster rate for a shorter duration.

Do the process in the same way as mentioned in method one. In this case, 30 PSI pressure will be applied through the Adjustment of the regulator.

Sugars selection

The sugar starts are most commonly used and I thought to be ideal for carrying out natural carbonation Archon sugar, table sugar, cane sugar, maltose syrup, honey, brown sugar, molasses, and sorghum.

You can find information about another method of natural carbonation, spunding, here


In this brief guide, we answered the question “how is beer carbonated” with an in-depth analysis of the carbonations used in beer. Moreover, we discussed what is natural and forced carbonations, what are the methods of natural and forced carbonation, and which sugars can be added during the carbonation process.


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