The Coffee Kits

The Science Behind the Perfect Chemex Coffee Extraction

Coffee has been a popular beverage for centuries, and over the years, different brewing techniques have emerged. One of the most popular methods is the Chemex coffee maker, which was invented in 1941 by Peter Schlumbohm. The Chemex coffee maker is a pour-over coffee maker that uses a paper filter and a carafe. The coffee maker has become popular among coffee enthusiasts because it produces a clean, smooth, and flavorful coffee. In this article, we will explore the science behind the perfect Chemex coffee extraction.

The Chemex Coffee Maker and its Components

The Chemex coffee maker is made up of two main components: the carafe and the filter. The carafe is made of glass and has a narrow neck and a wide base. The filter is made of paper and is folded into a cone shape. The filter is placed in the neck of the carafe, and the coffee grounds are placed in the filter.

Coffee Extraction and the Factors that Affect It

Coffee extraction is the process of extracting the soluble compounds from the coffee grounds. The compounds that are extracted include caffeine, acids, and oils. The extraction process is affected by several factors, including grind size, water temperature, brew time, and coffee-to-water ratio.

Grind Size

The grind size is one of the most critical factors in coffee extraction. The grind size refers to the size of the coffee grounds. The Chemex coffee maker requires a medium-coarse grind. The medium-coarse grind allows for a slow and even extraction of the coffee. If the grind is too fine, the coffee will be over-extracted, and if the grind is too coarse, the coffee will be under-extracted.

Water Temperature

The water temperature is another critical factor in coffee extraction. The ideal water temperature for the Chemex coffee maker is between 195°F and 205°F. If the water is too hot, it will over-extract the coffee, and if the water is too cold, it will under-extract the coffee.

Brew Time

The brew time is the amount of time that the water is in contact with the coffee grounds. The ideal brew time for the Chemex coffee maker is between 3 and 4 minutes. If the brew time is too short, the coffee will be under-extracted, and if the brew time is too long, the coffee will be over-extracted.

Coffee-to-Water Ratio

The coffee-to-water ratio is the ratio of coffee to water. The ideal coffee-to-water ratio for the Chemex coffee maker is between 1:15 and 1:17. If there is too much coffee, the coffee will be over-extracted, and if there is too little coffee, the coffee will be under-extracted.

The Chemex Coffee Extraction Process

The Chemex coffee extraction process is straightforward. First, boil the water and let it cool for a minute or two. Next, place the filter in the neck of the carafe and add the coffee grounds. Pour a small amount of water over the coffee grounds and let it sit for 30 seconds. This process is called blooming and allows the coffee to degas. After blooming, slowly pour the remaining water over the coffee grounds in a circular motion. Wait for the water to drip through the filter and into the carafe. The entire process should take between 3 and 4 minutes. Once the coffee is brewed, remove the filter and enjoy your perfect Chemex coffee.

Conclusion

The Chemex coffee maker is an excellent brewing method for coffee enthusiasts. The process of coffee extraction is affected by several factors, including grind size, water temperature, brew time, and coffee-to-water ratio. Understanding the science behind the perfect Chemex coffee extraction can help you create the perfect cup of coffee every time.