Degassing Coffee: Definition, Importance and Factors to Consider

This article will explain everything you need to know about coffee degassing - definition, the process of degassing coffee beans, and the ideal way to store coffee after degassing.
Samanta Fryer
Samanta Fryer
Samanta Fryer is our senior editor and content writer, at CoffeeVibe. Apart from writing and reading, she’s fond of the coffee brewing process and enjoys tasting new coffe read more
Reviewed By
Ryan Hendricks
Ryan Hendricks
Ryan Hendricks is our tester, who puts products through their paces. He used to be a barista and is now a full-time coffee enthusiast. He’s always testing out new gadgets, read more
Last updated: August 28, 2023
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After water, coffee is arguably the most popular drink in the world. Apart from the fact that it is commonly the first beverage consumed in the day, it’s also an energy booster that contains many nutrients which help to lessen depression, reduce the risk of having liver disease and type 2 diabetes. Also, a Harward study confirmed that the consumption of 3 to 5 standard cups of coffee daily had been consistently associated with a reduced risk of several chronic diseases Trusted Source Coffee | The Nutrition Source | Harvard T.H. Chan School of Public Health Coffee lovers around the world who reach for their favorite morning brew probably aren’t thinking about its health benefits or risks. .

Coffee is also used as a welcome gesture at visits and meet-ups. One of the most sought-after coffees globally is Jamaica blue mountain, which ensures optimum flavor and scent. Most people prefer freshly prepared coffee to stale coffee, but little do they know that it can result in a bad brew if served immediately after it has been roasted. Degassing coffee before brewing solves this dilemma as it releases the gas from the beans.

What is Coffee Degassing?

Degassing Coffee: Definition, Importance and Factors to Consider
During degassing, beans lose 90% of oxygen and 10% of nitrogen, volatile compounds, and other gases.

Every conscientious brewer understands that the appropriate amount of carbon dioxide in beans can improve flavor extraction, whilst too much can ruin the coffee’s quality. So, it has to be sufficiently degassed to have the perfect taste.

Coffee degassing is the release of gases after the coffee has been roasted. The gases formed inside the beans during the roasting process, primarily carbon dioxide, begin to escape after the beans have been roasted. When you make your coffee and it hasn’t been appropriately degassed and so contains too much CO2, the escaping gas will cause tiny bubbles making contact between the coffee grounds and the water to be disrupted, thereby reducing the flavor of the coffee.

Degassing is the difference between a good cup of coffee and a bad cup of coffee. It does not, however, have to be complicated. It’s simply a matter of giving roasted beans enough time to release gases consisting mainly of carbon dioxide.

Brewing coffee that has just been roasted might have a detrimental impact on the flavor and appearance of the coffee. As a result, it is best to wait and brew a few days after the coffee has been roasted. During this period of waiting, degassing occurs.

How Important Is It to Degas Coffee?

Suppose you want a tasty cup of coffee. In that case, you will definitely have to degas it because if you don’t, you are only writing an invitation to small bubbles to occur throughout the brewing process, which destroys your tasty expectation.

Gases in Coffee Beans

Nitrogen, various gases, and volatile chemicals account for 10% of the gases formed during roasting. In comparison, carbon dioxide constitutes approximately 90% of the total gas in coffee, which is too much, and if not properly degassed, it will produce a bad result.

These gases are primarily found in freshly prepared coffees, as the older coffees would have started degassing since they were made, so you have to let your freshly prepared coffee bloom Trusted Source Coffee-brewing tips to help you make a better cup at home | The Washington Post We have tips from roasters, from baristas and from the Food staff, for both beginners and the more advanced home coffee brewer. adequately if you want your desired taste.

Taste and Freshness

Too much gas in your coffee repels water, and as a result, flavor extraction is inconsistent, causing the coffee to have a less-than-ideal flavor and quality. Frequently, it produces a sour taste.

Degassing is substantially accelerated if you grind your coffee finely before brewing. This is because the more you grind, the more the cells that hold these gases are broken down and released. This makes your coffee have a fresh texture and suitable appearance.

How do You Degas Beans?

There are basically three ways by which you can degas beans. They are the brewing method, processing method, and roast profile method.

Brewing Method

Degassing Coffee: Definition, Importance and Factors to Consider
Brewing coffee is the process of extracting the soluble material in roasted and ground coffee.

Coffee brewing is the process of removing the soluble material from roasted and ground coffee. Many distinct components are extracted from the ground beans when coffee is brewed in hot water, thereby freeing the coffee of gas.

The brewing method can be categorized into two broad parts. They are:

  • Immersion: This kind of brewing means that the coffee beans are completely submerged in hot water, and over time, the water extracts the coffee, thereby separating it from the carbon dioxide and other gases. Immersion is relatively easy; all you have to do is add hot water, wait for a couple of minutes, and then have your coffee ready.
  • Percolation: This kind of brewing involves the continuous water flow through a bed of ground coffee and a filter. If enough hot water is added, more soluble material can be extracted into the beverage. However, you have to be conscious of the amount of water you add, as you wouldn’t want all the carbon dioxide to disappear.

Processing Method

Degassing Coffee: Definition, Importance and Factors to Consider
Coffee processing removes the skin, pulp, mucus, and parchment paper around the coffee beans.

There are diverse processing methods in coffee preparation. They are:

  • Natural Processed Coffee: Also referred to as dry-processed coffee
  • Washed Processed Coffee:  Also called wet-processed coffee
  • Honey Processed Coffee: Combination of the natural and washed methods

These processes produce different tastes and profiles as they degas coffee differently. Dry processed coffees can be among the best you’ve ever tasted when appropriately prepared.

It is usually juicy and creamy. Wet coffees have a cleaner, and fresher profile than dry coffees and the flavor notes are easier to distinguish. Honey coffees have a diverse and nuanced flavor profile, just like wet coffees, they have a cleaner profile than dry coffees.

Roast Profile

Degassing Coffee: Definition, Importance and Factors to Consider
Scheme of the roast profile: roasting temperature and roasting time of different types of coffee.

The roast profile is the temperature of the roast and the roasting time. To a large extent, the roast profile determines which flavor and quality of the coffee will remain. Therefore, the gas present in coffee beans can be removed by configuring the temperature and roasting time appropriately.

Remember that overdoing it will make you lose flavors and the texture you want. Therefore, an ideal dark roast process should be followed in order to keep the flavor from the origin of the beans intact.

What Factors Can Affect the Time of Coffee Degassing

Every coffee is made of different components – harvesting techniques, sizes of beans, varying quantities of water and gas, which determine how long the degassing process will take. Also, the process used in making them – brewing method, processing method, and roast profile- causes the degas process’s varying nature.

If you prepare coffees using the brewing method, you can make use of them within a few days of roasting. This is because the coffee spends more time in contact with water, which releases the gas faster.

With the processing method, washed and honey processed coffee takes a shorter period to degas when compared to the naturally processed coffee. The dry-processed coffee needs a little bit more time to release the gas formed in the beans.

If a dark roast is used, degassing will be done quickly as the bean would have degraded more, the sugars would have had time to transform, and there would be more small openings that allow carbon dioxide to escape. According to most dark roast coffee reviews, Intenso has been identified as the most flavorful coffee with a stronger and more robust flavor.

But with a light roast, more of the bean is retained and as a result, may require more degassing time. However, light roast coffee beans’ natural features still shine through and consumers are beginning to take an interest in their bright acidity and mild body.

How to Know If the Degassing of Coffee Beans Is Complete

When it comes to degassing coffee beans, the most important requirement is patience. This entails as much as grinding your beans and properly storing them. This process will remove almost all the carbon dioxide and volatile components that make a coffee stale.

While patience is essential for degassing coffee beans, it’s also critical not to leave your beans sitting for too long. As previously said, a small amount of carbon dioxide is beneficial to your brew: it serves as a freshness indicator and aids in the preservation of the flavors and scents of your coffee.

However, about 40% of the gas formed in your coffee beans is released within 24 hours, but it will still take about 2 to 14 days for the appropriate degas process to be achieved.

How to Prevent Coffee from Blooming

Blooming is the saturation of the coffee ground by introducing water. When coffee blooms, the ground swells, and bubbles (carbon dioxide) rise to the liquid’s surface. To prevent this from happening, the following factors must be considered.

  • The freshness of the coffee: Blooming is inevitable if the bean is too fresh.
  • The roasting of the coffee: The darker you roast, the less carbon dioxide you’ll have when you bloom.
  • The firmness of the bean: CO2 release can be difficult because of the hardness of the bean, thereby slowing rapid degassing and increasing blooming.

How to Store Coffee After Degassing

Coffee beans that are not properly stored might develop a musty odor. As a result, the distinctive aroma of the ideal coffee you want will be lost. If you go on to brew, you’ll end up with a bitter cup of coffee. Therefore, it is necessary that you store and package your coffee very well.

  • Coffee beans should be stored in a dry location.
  • It should be stored in a dry container. It would be best to use a one-way valve for packaging as it allows carbon dioxide to escape slowly while preventing oxygen from entering the container. It also keeps the container from expanding.
  • Also, you should check for airtightness, moisture protection, light protection, and heat protection when selecting the coffee storage container to use.

Final Thoughts

To have the flavor and profile you desire in your coffee, degassing it will be worth the waiting. It is also advisable that you select the best coffee beans if you want to have a good and tasty cup of coffee.
With the three coffee degassing steps discussed earlier, you shouldn’t have any problem making some quality coffee. Whether you’re using the processing method, brewing, or roast profile method, you’ll achieve the aim of gas removal.
Degassing coffee is optional — but it is easily the difference between an excellent cup of coffee and not-so-good coffee.


Coffee | The Nutrition Source | Harvard T.H. Chan School of Public Health
Coffee lovers around the world who reach for their favorite morning brew probably aren’t thinking about its health benefits or risks.
Coffee-brewing tips to help you make a better cup at home | The Washington Post
We have tips from roasters, from baristas and from the Food staff, for both beginners and the more advanced home coffee brewer.

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