The Coffee Kits

The Science Behind Chemex Coffee Pour Over: Understanding Extraction and Brew Time

Coffee has come a long way since it was first discovered in Ethiopia in the 15th century. Today, coffee preparation has become an art form, with different brewing methods and techniques producing diverse results. One such method is the Chemex coffee pour over, which has gained popularity among coffee enthusiasts for its ability to produce a smooth and flavorful cup of coffee. In this article, we'll delve into the science behind the Chemex coffee pour over and understand how extraction and brew time affect the final product.

What is a Chemex coffee pour over?

A Chemex coffee pour over is a manual brewing method that involves pouring hot water over coffee grounds in a Chemex carafe. The Chemex carafe is made of glass and has a unique hourglass shape, which allows for optimal coffee extraction. The coffee grounds are placed in a paper filter, and hot water is poured over them in a circular motion. The water drips through the filter and into the carafe, producing a clean and flavorful cup of coffee.

Extraction: The Key to a Good Cup of Coffee

Extraction is the process of dissolving the soluble compounds in coffee beans and transferring them to the water. The goal of extraction is to extract the desirable compounds, such as caffeine and flavor, while leaving undesirable compounds, such as bitterness and sourness, behind. The extraction process is influenced by several factors, including the grind size, water temperature, and brew time.

Grind Size

The grind size of the coffee beans plays a crucial role in extraction. If the coffee is ground too coarse, the water will flow through the grounds too quickly, resulting in an under-extracted cup of coffee. On the other hand, if the coffee is ground too fine, the water will take too long to pass through, resulting in an over-extracted cup of coffee. For Chemex coffee pour over, a medium grind size is recommended, as it allows for optimal extraction.

Water Temperature

The water temperature also affects extraction. If the water is too hot, it can over-extract the coffee, resulting in a bitter and unpleasant taste. If the water is too cold, it can under-extract the coffee, resulting in a weak and flavorless cup. For Chemex coffee pour over, the water temperature should be between 195-205°F (90-96°C).

Brew Time

The brew time refers to the amount of time that the water is in contact with the coffee grounds. The longer the brew time, the more extraction will occur, resulting in a stronger and more flavorful cup of coffee. However, if the brew time is too long, it can over-extract the coffee and result in a bitter taste. For Chemex coffee pour over, a brew time of 4-5 minutes is recommended.

The Final Product

By understanding the science behind extraction and brew time, you can achieve the perfect cup of Chemex coffee pour over. The final product should be a smooth and flavorful cup of coffee, with a clean finish and no bitterness or sourness. The Chemex coffee pour over is a great option for coffee enthusiasts who want to enjoy a high-quality cup of coffee with minimal equipment and fuss.

Conclusion

The Chemex coffee pour over is a simple and effective brewing method that produces a smooth and flavorful cup of coffee. By understanding the science behind extraction and brew time, you can master the art of the Chemex coffee pour over and enjoy a high-quality cup of coffee in the comfort of your own home.